TECHNOLOGICAL FIELD

[0001] This application claims the benefit of and priority to both US Provisional Application No. 63/325,451 filed March 30, 2022 and US Provisional Application No. 63/392,030 filed July 25, 2022, the disclosure of which is incorporated herein by reference.

[0002] This invention relates to novel covalently tethered phosphine-borane catalyst complexes uses thereof, such as the generation of polymers and block copolymers of polycarbonate and polyesters.

BACKGROUND

[0003] Polymerization catalysts are of great use in industry. Hence there is interest in finding new catalyst systems that increase the commercial usefulness of the catalyst and allow the production of polymers having improved properties.

[0004] Copolymerization of CO2 and epoxide to produce polycarbonates is a challenging reaction. The more significant challenges include: (1) the polymerization is usually mediated by transition metal-based catalysts which are expensive, (2) the activity is usually low, typically with turnover numbers of less than 1,000 per catalyst, and (3) the conventional catalysts are hindered by water, alcohols, and carboxylic acids which are typically used as chain-transfer- agents to control polymer architecture and molecular weight.

[0005] Lewis pairs, that consist of a unlinked (untethered) Lewis acid and Lewis base, are known for their abilities to polymerized CCh/epoxide to form polyalkylene carbonate (J. Am. Chem. Soc. 2016, 138, 35, 11117 ). However, such an untethered system has three main drawbacks: (1) low activity (usually < 4,000 TON), (2) low temperature capability (< 100°C), and (3) intolerance toward water or chain-transfer agents such as alcohols.

[0006] Other relevant background may be found in Chinese patent publication CN112390819.

SUMMARY

[0007] Exemplary' embodiments described herein relate to a tertiary phosphine-borane catalyst complex represented by the Formula (I): wherein: B* is a group 13 element, preferably boron or aluminum, or more preferably boron;

P constitutes a tertiary phosphine moiety wherein P is covalently bonded to Y, R ³ , and R ⁴ , and P is not directly bonded to more than two nitrogen atoms; each of R ¹ , R ² , R ³ , and R ⁴ is independently a hy drocarbyl, a non-halogenated substituted hydrocarbyl group, or a heteroatom-containing group; each of R ¹ , R ² , R ³ , and R ⁴ can optionally comprise a tri-substituted borane or trisubstituted phosphine moiety;

R ¹ and R ² , R ³ and R ⁴ , R ¹ and Y, R ³ and Y, R ¹ and R ³ , and R ¹ and R ² and R ³ are optionally fused to form cyclic or multi cyclic rings; and

Y is a non-halogenated linking group having 1 to 50 non-hydrogen atoms, preferably 2 to 40 non-hydrogen atoms, more preferably 3 to 10 non-hydrogen atoms, preferably a trimethylene, a tetramethylene, a pentamethylene, a hexamethylene, a heptamethylene, an octamethylene, -CH ₂ CH2Si(Me2)-CH ₂ CH2-, or -CH ₂ (C6H ₄ )-CH2-.

DETAILED DESCRIPTION

[0008] To address the above needs, among other things, a catalyst family based on phosphine-boranes has been developed. These catalysts can facilitate the copolymerization of epoxides and CO ₂ under a wide range of temperatures from 25°C to 180°C. These catalysts are inexpensive and metal-free, often showing excellent activity for CHO/CO ₂ copolymerization with turnover numbers of 1,000 or more. In the presence of bifunctional or multi-functional chain-transfer-agents, these catalysts can produce additional telechelic polymer chains.

Definitions

[0009] For the purposes of this invention and the claims thereto, the new numbering scheme for the Periodic Table Groups is used as described in Chemical and Engineering News, v.3(5), pg. 27 (1985). For example, a “group 4 metal” is an element from group 4 of the Periodic Table, e.g. Hf, Ti, or Zr.

[0010] The terms “substituent,” “radical,” “group,” and “moiety” may be used interchangeably.

[0011] “Conversion” is the amount of monomer that is converted to polymer product, and is reported as mol% and is calculated based on the polymer yield and the amount of monomer fed into the reactor. [0012] “Catalyst activity” is a measure of how active the catalyst is and is reported as the grams of product polymer (P) produced per millimole of catalyst (cat) used per hour (gP.mmolcat '.h ¹ ).

[0013] The term “heteroatom” refers to any group 13-17 element, excluding carbon. A heteroatom may include B, Si, Ge, Sn, N, P, As, O, S, Se, Te, F, Cl, Br, and I. The term “heteroatom” may include the aforementioned elements with hydrogens attached, such as BH, BH2, SiH2, OH, NH, NH2, etc. The term “substituted heteroatom” describes a heteroatom that has one or more of these hydrogen atoms replaced by ahydrocarbyl or substituted hydrocarbyl group(s).

[0014] The term “hydrocarbon” is a class of compounds consisting of the elements carbon (C) and hydrogen (H) only.

[0015] The term "hydrocarbyl" means a univalent group formed by removing a hydrogen atom from a hydrocarbon.

[0016] Unless otherwise indicated, (e.g., the definition of "substituted hydrocarbyl", "substituted aromatic", etc.), the term “substituted” means that at least one hydrogen atom has been replaced with at least one non-hydrogen group, such as a hydrocarbyl group, a heteroatom, or a heteroatom containing group, such as halogen (such as Br, Cl, F or I) or at least one functional group such as -NR*2, -OR*, -SeR*, -TeR*, -PR*2, -AsR*2, -SbR*2, -SR*, -BR*2, -SiR*3, -GeR*3, -SnR* ₃ , -PbR*3, where each R* is independently a hydrocarbyl or halocarbyl radical, and two or more R* may join together to form a substituted or unsubstituted completely saturated, partially unsaturated, or aromatic cyclic or polycyclic ring structure), or where at least one heteroatom has been inserted within a hydrocarbyl ring.

[0017] The term "substituted hydrocarbyl" means a hydrocarbyl radical in which at least one hydrogen atom of the hydrocarbyl radical has been substituted with at least one heteroatom (such as halogen, e.g., Br, Cl, F or I) or heteroatom-containing group (such as a functional group, e.g., -NR*2, -OR*, -SeR*, -TeR*, -PR* ₂ , -AsR* ₂ , -SbR* ₂ , -SR*, -BR* ₂ , -SiR* ₃ , -GeR* ₃ , -SnR* ₃ , -PbR* ₃ , where each R* is independently a hydrocarbyl or halocarbyl radical, and two or more R* may join together to form a substituted or unsubstituted completely saturated, partially unsaturated, or aromatic cyclic or polycyclic ring structure), or where at least one heteroatom has been inserted within a hydrocarbyl ring. The term "hydrocarbyl substituted phenyl" means a phenyl group having 1, 2, 3, 4 or 5 hydrogen groups replaced by ahydrocarbyl or substituted hydrocarbyl group. For example, the "hydrocarbyl substituted phenyl" group can be represented by the formula: where each of R ^a , R ^b , R ^c , R ^d , and R ^e can be independently selected from hydrogen, C1-C40 hydrocarbyl or C1-C40 substituted hydrocarbyl, a heteroatom or a heteroatom-containing group (provided that at least one of R ^a , R ^b , R ^c , R ^d , and R ^e is not H), or two or more of R ^a , R ^b , R ^c , R ^d , and R ^c can be joined together to form a C4-C62 cyclic or polycyclic hydrocarbyl ring structure, or a combination thereof.

[0018] The term "non-halogenated” excludes Group 17 elements. For example, the term "non-halogenated substituted hydrocarbyl" means a substituted hydrocarbyl radical that does not comprise any Group 17 element.

[0019] The term "substituted aromatic," means an aromatic group having 1 or more hydrogen groups replaced by a hydrocarbyl, substituted hydrocarbyl, heteroatom or heteroatom containing group.

[0020] The term "substituted phenyl," mean a phenyl group having 1 or more hydrogen groups replaced by a hydrocarbyl, substituted hydrocarbyl, heteroatom or heteroatom containing group.

[0021] The terms dihydrocarbylamino and dihydrocarbylphosphino mean a nitrogen or phosphorus group bonded to two hydrocarbyl groups. Examples of suitable dihydrocarbylamino and dihydrocarbylphosphino groups can include dimethylamino, dimethylphosphino, diethylamino, diethylphosphino, and all isomers of dipropylamino, dipropylphosphino, dibutylamino, dibutylphosphino, and the like.

[0022] The term "tri-substituted borane" means a borane group having 3 hydrogen groups replaced by a hydrocarbyl, substituted hydrocarbyl, heteroatom or heteroatom containing group.

[0023] The terms "tri-substituted phosphine" or “tertiary phosphine” means a phosphine group having 3 hydrogen groups replaced by a hydrocarbyl, substituted hydrocarbyl, heteroatom or heteroatom containing group.

[0024] The term “substituted adamantany 1” means an adamantanyl group having 1 or more hydrogen groups replaced by a hydrocarbyl, substituted hydrocarbyl, heteroatom or heteroatom containing group. The terms “alkoxy” and “alkoxide” mean an alkyl or aryl group bound to an oxygen atom, such as an alkyl ether or aryl ether group/radical connected to an oxygen atom and can include those where the alkyl/aryl group is a Ci to Cio hydrocarbyl (also referred to as a hydrocarbyloxy group). The alkyl group may be straight chain, branched, or cyclic. The alkyl group may be saturated or unsaturated. Examples of suitable alkoxy radicals can include methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, sec-butoxy, tert-butoxy, phenoxy.

[0025] The term "aryl" or "aryl group" means an aromatic ring and the substituted variants thereof, such as phenyl, 2-methyl-phenyl, xylyl, 4-bromo-xylyl. Likewise, heteroaryl means an aryl group where a ring carbon atom (or two or three ring carbon atoms) has been replaced with a heteroatom, such as N, O, or S. As used herein, the term "aromatic" also refers to pseudoaromatic heterocycles which are heterocyclic substituents that have similar properties and structures (nearly planar) to aromatic heterocyclic ligands, but are not by definition aromatic; likewise the term aromatic also refers to substituted aromatics.

[0026] The term "arylalkyl" means an ary l group where a hydrogen has been replaced with an alkyl or substituted alkyl group. For example, 3,5'-di-tert-butyl-phenyl indenyl is an indene substituted with an arylalkyl group. When an arylalkyl group is a substituent on another group, it is bound to that group via the aryl.

[0027] The term "alkylaryl" means an alkyl group where a hydrogen has been replaced with an aryl or substituted aryl group. For example, phenethyl indenyl is an indene substituted with an ethyl group bound to a benzene group. When an alkylaryl group is a substituent on another group, it is bound to that group via the alkyl.

[0028] The term "ring atom" means an atom that is part of a cyclic ring structure. By this definition, a benzyl group has six ring atoms and tetrahydrofuran has 5 ring atoms.

[0029] A heterocy clic ring is a ring having a heteroatom in the ring structure as opposed to a heteroatom substituted ring where a hydrogen on a ring atom is replaced with a heteroatom. For example, tetrahydrofuran is a heterocyclic ring and 4-N,N-dimethylamino-phenyl is a heteroatom-substituted ring. Other examples of heterocycles may include pyridine, imidazole, and thiazole.

[0030] The terms “hydrocarbyl radical,” “hydrocarbyl group,” or “hydrocarbyl” may be used interchangeably and are defined to mean a group consisting of hydrogen and carbon atoms only. For example, a hydrocarbyl can be a Ci-Cioo radical that may be linear, branched, or cyclic, and when cyclic, aromatic or non-aromatic. Examples of such radicals may include, but are not limited to, alkyl groups such as methyl, ethyl, propyl (such as n-propyl, isopropyl, cyclopropyl), butyl (such as n-butyl, isobutyl, sec-butyl, tert-buty l, cyclobutyl), pentyl (such as iso-amyl, cyclopentyl) hexyl (such as cyclohexyl), octyl (such as cyclooctyl), nonyl, decyl (such as adamantanyl), undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, icosyl, henicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, or tricontyl, and aryl groups, such as phenyl, benzyl, and naphthyl.

[0031] For purposes of this specification and the claims appended thereto, when a polymer or copolymer is referred to as compnsing a monomer (the monomer present in such polymer or copolymer is the polymerized form of the monomer). For example, when a copolymer is said to have a "caprolactone" content of 35 wt% to 55 wt%, it is understood that the mer unit in the copolymer is derived from caprolactone in the polymerization reaction and said derived units are present at 35 wt% to 55 wt%, based upon the weight of the copolymer. A “polymer” has two or more of the same or different mer units. A “homopolymer” is a polymer having mer units that are the same. A “copolymer” is a polymer having two or more mer units that are different from each other. A “terpolymer” is a polymer having three mer units that are different from each other. Accordingly, the definition of copolymer, as used herein, includes terpolymers and the like. “Different” as used to refer to mer units indicates that the mer units differ from each other by at least one atom or are different isomerically. A "polylactone" is a polymer where the mer unit(s) in the polymer are derived from one or more lactones (where the lactone mer units may be ring opened). A "caprolactone polymer" or "caprolactone copolymer" is a polymer or copolymer comprising at least 50 mol% of one or more caprolactone derived units (such as caprolactone, decalactone, or methylcaprolactone).

[0032] As used herein, Mn is number average molecular weight, Mw is weight average molecular weight, and Mz is z average molecular weight, wt% is weight percent, and mol% is mole percent. Molecular weight distribution (MWD), also referred to as polydispersity index (PDI), is defined to be Mw divided by Mn. Unless otherwise noted, all molecular weight units (e.g., Mw, Mn, Mz) are reported in units of g/mol (g mol' ¹ ).

[0033] A “catalyst system” is a combination of at least one catalyst compound, an optional co-activator, an optional chain transfer reagent, and an optional support material. The terms “catalyst compound” and “catalyst complex” are used interchangeably. A polymenzation catalyst system is a catalyst system that can polymerize monomers to polymer.

[0034] In the description herein, the catalyst may be described as a catalyst, catalyst compound, or a catalyst complex, and these terms are used interchangeably. [0035] The following abbreviations may be used herein: Me is methyl, Et is ethyl, Pr is propyl, cPr is cyclopropyl, nPr is n-propyl, iPr is isopropyl, Bu is butyl, nBu is normal butyl, iBu is isobutyl, sBu is sec-butyl, tBu is tert-butyl, p-tBu is para-tertiary butyl, Hx is hexyl, Cy is cyclohex, Oct is octyl, Ph is phenyl, Cbz is Carbazole, p-Me is para-methyl, Bz and Bn are benzyl (i.e., CH ₂ Ph), dme is 1 ,2-dimethoxy ethane, tol is toluene, EtOAc is ethyl acetate, TMS is trimethylsilyl, TIBAL is triisobutylaluminum, TNOAL is tri(n-octyl)aluminum, THF (also referred to as thf) is tetrahydrofuran, RT is room temperature (and is 23°C unless otherwise indicated).

[0036] The term “diastereomers” are defined as non-mirror image, non-identical stereoisomers. They occur when two or more stereoisomers of a compound have different configurations at one or more (but not all) of the equivalent (related) stereocenters and are not mirror images of each other

Phosphine-Borane Catalyst Complexes

[0037] Embodiments described herein relate to tertiary pnictogen-boranes catalyst complexes represented by the Formula (I). Catalysts of Formula (I) can catalyze the polymerization of one or more epoxides and one or more of CO2, COS, and CS2.

[0038] Exemplary' embodiments described herein relate to a tertiary phosphine-borane catalyst complex represented by the Formula (I): wherein:

B* is a group 13 element, preferably boron or aluminum, or more preferably boron;

P constitutes a tertiary phosphine moiety wherein P is covalently bonded to Y, R ³ , and R ⁴ , and P is not directly bonded to more than two nitrogen atoms; each of R ¹ , R ² , R ³ , and R ⁴ is independently a hy drocarbyl, a non-halogenated substituted hydrocarbyl group, or a heteroatom-containing group; each of R ¹ , R ² , R ³ , and R ⁴ can optionally comprise a tri-substituted borane or trisubstituted phosphine moiety;

R ¹ and R ² , R ³ and R ⁴ , R ¹ and Y, R ³ and Y, R ¹ and R ³ , and R ¹ and R ² and R ³ are optionally fused to form cyclic or multi cyclic rings; and

Y is a non-halogenated linking group having 1 to 50 non-hydrogen atoms, preferably 2 to 40 non-hydrogen atoms, more preferably 3 to 10 non-hydrogen atoms, preferably a trimethylene, a tetramethylene, a pentamethylene, a hexamethylene, a heptamethylene, an octamethylene, -CH ₂ CH2Si(Me2)-CH ₂ CH2-, or -CH ₂ (C6H ₄ )-CH ₂ -.

[0039] In some embodiments of Formula (I), R ¹ , R ² , R ³ , R ⁴ , and Y do not comprise a Group 2 to 12 metal. In some embodiments of Formula (I), R ¹ , R ² , R ³ , R ⁴ , and Y do not comprise a Group 3 to 11 transition metal.

[0040] In some embodiments, no phosphorus atom is directly bond to more than two nitrogen atoms.

[0041] In some embodiments of Formula (1), R ³ and/or R ⁴ is a secondary alkyl, a tertiary alkyl, or R ³ and R ⁴ are fused to form cyclic or multi cyclic rings.

[0042] In some embodiments of Formula (I), R ¹ , R ² , R ³ , and R ⁴ are hy drocarbons that contain 0, 1, or 2 B* moieties, and 0, 1, or 2 P moieties.

[0043] In some embodiments of Formula (I), R ¹ , R ² , R ³ , and R ⁴ contain heteroatoms to form heteroatom-C or heteroatom-P or heteroatom-B* bonds.

[0044] In some embodiments of Formula (I), each R ¹ , R ² , R ³ , and R ⁴ is independently an alkyl, substituted alky l, aiyl, or substituted aiyl group, such as a Ci to C50 (such as C2 to C30, such as C3 to C20) alkyl, Ci to C50 (such as C2 to C30, such as C3 to C20) substituted alkyl, C5 to C50 (such as C6 to C30, such as C6 to C20) aryl, or C5 to C50 (such as C6 to C30, such as C6 to C20) substituted aryl group.

[0045] Alternately, in some embodiments of Formula (I), R ¹ , R ² , R ³ , and R ⁴ are independently selected from methyl, ethyl, propyl, butyl, pentyl, neopentyl, adamantyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, phenyl, substituted phenyl (such as methylphenyl and dimethylphenyl), benzyl, substituted benzyl (such as methylbenzyl), naphthyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, norbomyl, substituted norbomyl and isomers thereof.

[0046] In some embodiments of Formula (I), one or more of R ¹ and R ² , R ³ and R ⁴ , R ¹ and Y, R ³ and Y, R ¹ and R ³ , and R ¹ and R ² and R ³ are fused and may form saturated or aromatic cyclic or multi cyclic groups.

[0047] In some embodiments of Formula (I), one or more of R ¹ , R ² , R ³ , and R ⁴ comprises one or more catalyst compositions selected form the group consisting of catalyst compositions represented by the Formula (I).

[0048] In some embodiments of Formula (I), each Y is independently a hydrocarbyl group, or substituted hydrocarbyl group, a group containing 14, 15, 16, or 17 heteroatom, or a substituted group 13, 14, 15, 16, or 17 heteroatom (such as a silyl group, a substituted silyl group, oxygen group, sulfur group, nitrogen group or phosphine group) such as an alkyl, substituted alkyl, aryl, or substituted aryl group, such as a Ci to Cso (such as C2 to C30, such as C3 to C20) alkyl, Ci to C50 (such as C2 to C30, such as C3 to C20) substituted alkyl, C5 to C50 (such as Ce to C30, such as Ce to C20) ary l, or C5 to C50 (such as Ce to C30, such as Ce to C20) substituted aryl group.

[0049] Alternately, in some embodiments of Formula (I), each Y is independently selected from methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, phenylene, substituted phenylene (such as 1 ,2-phenylene, 1,3-phenylene, 1,4 — phenylene, 1,8-naphthalene, methylphenylene and dimethylphenylene), benzyl, substituted benzyl (such as methylbenzyl), naphthyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, norbomyl, substituted norbomyl and isomers thereof.

[0050] In some embodiments of Formula (I), each Y is independently -O-, (-CH2-)n, where n is 1 to 50, alternately n is 2 to 30, alternately n is 3 to 12 (alternately n is 1, e.g., -CH2-), -CR2-, -SiR.2-, -GeR.2-, -NR-(where each R is independently methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl, heneicosyl, docosyl, tricosyl, tetracosyl, pentacosyl, hexacosyl, heptacosyl, octacosyl, nonacosyl, triacontyl, phenyl, substituted phenyl (such as methylphenyl and dimethylphenyl), benzyl, substituted benzyl (such as methylbenzyl), naphthyl, cyclohexyl, cyclohexenyl, methylcyclohexyl, norbomyl, or substituted norbomyl.

[0051] In some embodiments of Formula (I), Y is a bridging group containing at least one Group 13, 14, 15, 16, or 17 element, in particular boron or a Group 14, 15, 16, or 17 element. Examples of suitable bridging groups include P(=S)R*, P(=Se)R*, P(=O)R*, R*2C, R* ₂ Si, R* ₂ Ge, R* ₂ CCR*2, R* ₂ CCR* ₂ CR* ₂ , R* ₂ CCR*2CR* ₂ CR* ₂ , R*C=CR*, R*C=CR*CR* ₂ , R* ₂ CCR*=CR*CR*2, R*C=CR*CR*=CR*, R*C=CR*CR* ₂ CR*2, R* ₂ CSIR*2, R* ₂ SiSiR*2, R* ₂ SiOSiR* ₂ , R* ₂ CSiR* ₂ CR* ₂ , R* ₂ SiCR* ₂ SiR* ₂ , R*C=CR*SiR* ₂ , R* ₂ CGeR* ₂ , R* ₂ GeGeR* ₂ , R*2CGeR* ₂ CR* ₂ , R*2GeCR* ₂ GeR* ₂ , R* ₂ SiGeR* ₂ , R*C=CR*GeR* ₂ , R*B, R* ₂ C-BR*, R* ₂ C-BR*-CR*2, R* ₂ C-O-CR*2, R* ₂ CR*2C-O-CR*2CR*2,

R* ₂ C-O-CR* ₂ CR*2, R* ₂ C-O-CR*=CR*, R* ₂ C-S-CR*2, R*2CR* ₂ C-S-CR* ₂ CR*2, R* ₂ C-S-CR* ₂ CR*2, R* ₂ C-S-CR*=CR*, R* ₂ C-Se-CR*2, R* ₂ CR* ₂ C-Se-CR*2CR* ₂ , R* ₂ C-Se-CR* ₂ CR* ₂ , R* ₂ C-Se-CR*=CR*, R* ₂ C-N=CR*, R* ₂ C-NR*-CR* ₂ ,

R* ₂ C-NR*-CR* ₂ CR* ₂ , R* ₂ C-NR*-CR*=CR*, R* ₂ CR* ₂ C-NR*-CR* ₂ CR* ₂ , R* ₂ C-P=CR*, R* ₂ C-PR*-CR* ₂ , O, S, Se, Te, NR*, PR*, AsR*, SbR*, 0-0, S-S, R*N-NR*, R*P-PR*, 0-S, 0-NR*, 0-PR*, S-NR*, S-PR*, and R*N-PR* where R* is hydrogen or a Ci-C ₂ o containing hydrocarbyl, substituted hydrocarbyl, halocarbyl, substituted halocarbyl, silylcarbyl or germylcarbyl substituent and optionally two or more adjacent R* may join to form a substituted or unsubstituted, saturated, partially unsaturated or aromatic, cyclic or polycyclic substituent. Preferred examples for the bridging group Y include CH ₂ , CH ₂ CH ₂ , SiMe ₂ , SiPh ₂ , SiMePh, Si(CH ₂ ) ₃ , Si(CH ₂ ) ₄ , O, S, NPh, PPh, NMe, PMe, NEt, NPr, NBu, PEt, PPr, Me ₂ SiOSiMe ₂ , and PBu. In a preferred embodiment of the invention in any embodiment of any formula described herein, Y is represented by the formula ER ^y ₂ or (ER ^y ₂ ) ₂ , where E is C,

Si, or Ge, and each R ^y is, independently, hydrogen, halogen, Ci to C20 hydrocarbyl (such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, or dodecyl) or a Ci to C ₂ o substituted hydrocarbyl, and two R ^y can form a cyclic structure including aromatic, partially saturated, or saturated cyclic or fused ring system. Preferably, Y is a bridging group comprising carbon or silicon, such as dialkylsilyl, preferably Y is selected from CH ₂ , CH ₂ CH ₂ , C(CH ₃ ) ₂ , SiMe ₂ , Me ₂ Si-SiMe ₂ , cyclotrimethylenesilylene (Si(CH ₂ ) ₃ ), cyclopentamethylenesilylene (Si(CH ₂ )s) and cyclotetramethylenesilylene (Si(CH ₂ )4).

[0052] For Complex 1, R ¹ and R ² formed a fused ring with boron namely

9-Borabicyclo(3.3.1)nonane, R ³ = R ⁴ = tert-butyl, Y = trimethylene.

[0053] For Complex 2, R ¹ and R ² formed a fused ring with boron namely

9-Borabicyclo(3.3.1)nonane, R ³ = R ⁴ = tert-butyl, Y = pentamethylene.

[0054] For Complex 3, R ¹ and R ² formed a fused ring with boron namely

9-Borabicyclo(3.3.1)nonane, R ³ = R ⁴ = 1-adamantyl, Y = pentamethylene.

[0055] For Complex 4, R ¹ and R ² formed a fused ring with boron namely

9-Borabicyclo(3.3.1)nonane, R ³ and R ⁴ formed a fused ring with phosphine namely 9- phosphabicyclo(3.3.1)nonane, Y = pentamethylene.

[0056] Specific examples of catalyst complexes useful herein are shown below:

[0057] Additional catalyst structures of Formula (I) include:

[0058] Catalyst compounds that are particularly useful in this invention include one or more of: Complex 2 named as “(3-(9-borabicyclo[3.3.1]nonan-9-yl)pentyl)di-tert- butylphosphane”, Complex 3 named as “(5-(9-borabicyclo[3.3.1]nonan-9-yl)pentyl)di(- adamantan-l-yl)phosphane” are particularly of interest.

[0059] In alternate embodiments, in any of the processes described herein one phosphineborane catalyst complex is used, e.g. the catalyst complexes are not different. For purposes of this invention one catalyst complex is considered different from another if they differ by at least one atom.

[0060] In some embodiments, two or more different catalyst complexes are present in the catalyst system used herein. In some embodiments, two or more different catalyst complexes are present in the reaction zone where the process(es) described herein occur. It is optional to use the same initiator for the compounds, however, two different initiators can be used in combination.

[0061] The two catalyst complexes may be used in any ratio. Preferred molar ratios of (A) catalyst complex to (B) catalyst complex fall within the range of (A:B) 1 : 1000 to 1000: 1, alternatively 1 : 100 to 500: 1, alternatively 1 :10 to 200: 1, alternatively 1 : 1 to 100:1, and alternatively 1: 1 to 75: 1, and alternatively 5: 1 to 50: 1. The particular ratio chosen will depend on the exact complex chosen, the method of initiation, and the end product desired. In a particular embodiment, when using the two catalysts, useful mole percents, based upon the molecular weight of the catalysts, are 10 to 99.9% A to 0. 1 to 90% B, alternatively 25 to 99% A to 0.5 to 50% B, alternatively 50 to 99% A to 1 to 25% B, and alternatively 75 to 99% A to 1 to 10% B.

General Methods to Prepare the Phosphine-Borane Catalyst Compounds.

[0062] Method A: Phosphine chloride is allowed to react with alkenyl MgBr reagent in THF or diethyl ether at -30°C, followed by stirring at 25°C to 60°C for 24 - 96 hours to afford alkenyl dialkyl pnictogen, which can then react with hydrido borane in THF or dichloromethane at 20°C -65°C for 24 - 96 hours to form the catalyst complex. Method B: Secondary pnictogen is allowed to react with nBuLi (or MeLi) in THF or diethyl ether at -30°C, followed by stirring at 25°C to 60°C for 24 - 96 hours to afford alkenyl dialkyl phosphine, which can then react with hydrido borane in THF or dichloromethane at 20°C-65°C for 24 - 96 hours to form the catalyst complex.

Method A

Chain-Transfer Agents

[0063] In general, chain-transfer-agents (CTAs) allow the polymerization to produce additional polymer chains. CTAs can be used to produce additional polymer chains. CTA’s can also be used to control the molecular weights. CTAs useful with the catalyst complexes can include water, alcohols (such as di-alcohols), carboxylic acids (such as dicarboxylic acids), carboxylates, or thio groups. Examples include: water, ethanol, methanol, 1,4-benzenedimethanol, 1,2-trans- dihydroxy cyclohexane, and terephthalic acid. CTAs can also be an oligomer or a polymer featuring one or more than one alcohol or carboxylic acid end groups.

[0064] In embodiments, bifunctional chain-transfer agents (such as polyols) can be used with the catalyst complexes described herein to produce additional telechelic polymers with multiple functional groups (such as poly-ols). Useful bifunctional chain transfer agents include 1,4-benzenedimethanol, 1,2-trans- dihydroxy cyclohexane, terephthalic acid, or telechelic poly-ols. examples of chain-transfer-agents (CTAs): where represents oligomers or polymers containing one or more OH groups

Co-Activators

[0065] Co-activators may be used with the catalyst complexes. A co-activator is usually a

Lewis acid or a Lewis base that, by itself, does not catalyze the polymerization of CCh/epoxide or lactone or lactide. A co-activator, may be used in conjunction with an initiator in order to fomr an active catalyst complex. In some embodiments a co-activator can be pre-mixed with the catalyst complex before introduction into a reaction zone or may be introduced separately into the reaction zone. Compounds which may be utilized as co-activators include, for example, phosphonium halide and bis(triphenylphosphine)iminium halide, or triethyl borane, tricyclohexyl borane, tri-n-hexyl borane, etc.

Polymerization Processes

[0066] In embodiments herein, the invention relates to polymerization processes where one or more epoxide monomers and one or more of CO2, COS, CS2, are contacted with one or more catalyst compositions as described above, to form oxygen containing polymers, such as polyalkylene carbonates, polyalkylene ether carbonates, or polyether.

(X = 0 or S) [0067] In embodiments herein, the invention relates to polymerization processes where carbon dioxide is copolymerized with vinyl cyclohexene dioxide or limonene dioxide to form polyalkylene carbonate polymers comprising pendant cyclic carbonate groups as shown below.

[0068] In embodiments herein, the invention relates to polymerization processes where one or more epoxide monomers and one or more of cyclic anhydrides, are contacted with one or more catalyst compositions as described above, to form poly(epoxide)(cyclic anhydride), poly(epoxide)(cyclic anhydride) ether, or poly ether.

[0069] In embodiments herein, the invention relates to polymerization processes where one or more lactone or lactide monomers and, are contacted with catalyst compounds as described above, to form polylactone polymers, such as polycaprolactone, poly decalactone, polymethylcaprolactone, polylactide, or copolymers thereof.

[0070] In embodiments herein, the invention relates to polymerization processes where one or more lactone monomers and, optionally, one or more caprolactone monomers are contacted with one or more catalyst compounds as described above, to form polylactone polymers, such as polycaprolactone, polydecalactone, polymethylcaprolactone, or copolymers thereof and thereafter said polymer is contacted with one or more epoxide monomers, one or more of CO2, COS, CS2, cyclic anhydrides and one or more catalyst compositions as described above, to form copolymers, such as random copolymers, gradient copolymers, or block copolymers.

[0071] An embodiment of the present technological advancement relates to a method to produce polymers comprising: contacting a catalyst composition represented by the Formula (I) with one or more caprolactones, to obtain poly caprolactones.

[0072] Epoxide monomers useful herein include epoxides, substituted epoxides, and isomers thereof. Examples of epoxides include, but are not limited to, cyclohexene oxide, methyl cyclohexene oxide, dimethyl cyclohexene oxide, ethyl cyclohexene oxide, vinyl cyclohexene oxide, vinyl cyclohexene dioxide, limonene oxide, limonene dioxide, ethylene oxide, propylene oxide, butylene oxide, isobutylene oxide, pentene oxide, hexene oxide, heptane oxide, octene oxide, epichlorohydrin, glycidyl methyl ether, glycidyl ethyl ether, glycidyl n-butyl ether, glycidyl isobutyl ether, glycidyl allyl ether, glycidyl 2-ethylhexyl ether, glycidyl benzyl ether, glycidyl phenyl ether, norbomene oxide.

[0073] Cyclic anhydride monomers useful herein include succinic anhydride, maleic anhydride, methyl succinic anhydride, citraconic anhydride, phenyl succinic anhydride, glutaric anhydride, digly colic anhydride, pimelic anhydride, phthalic anhydride, cyclohexene anhydride, cyclohexane anhydride, cyclopentane anhydride, carbic anhydride.

[0074] Exemplary' epoxide monomers include cyclohexene oxide and vinyl cyclohexene oxide and their respective homologs and derivatives.

[0075] In embodiments of the invention, the epoxide monomer (such as cyclohexene oxide and vinyl cyclohexene oxide) is combined with one or more of CO2, COS, CS2, such as CO2.

[0076] Lactone monomers include lactones and substituted lactones such as methyl caprolactone and decalactone. Lactone comprises caprolactone.

[0077] Lactones are cyclic carboxylic esters, containing a l-oxacycloalkan-2-one structure (“C(=O)“O”), “substituted lactones’" are lactones that have one or more hydrogen groups replaced by hydrocarbyl, substituted hydrocarbyl, heteroatom or heteroatom containing group and or have one or more ring atoms replaced by a heteroatom.

[0078] Lactone monomers useful herein include caprolactone, substituted caprolactone (such as alkyl-caprolactone, where the alkyl is a Ci to C30 alkyl), such as methyl-caprolactone), valerolactone, propiolactone, butyrolactone, hexalactone, decalactone.

[0079] Monomers and comonomers used herein may be linear, branched, or cyclic, and if cyclic may be strained or unstrained, monocyclic or polycyclic, and may optionally include heteroatoms and/or one or more functional groups.

Polymerization

[0080] A solution polymerization is a polymerization process in which the polymer is dissolved in a liquid polymerization medium, such as an inert solvent or monomer(s) or their blends. A solution polymerization is typically homogeneous. A homogeneous polymerization is one where polymer product is dissolved in the polymerization medium, such as 80 wt% or more, 90 wt% or more or 100% of polymer product is dissolved in the reaction medium. Such systems are preferably not turbid as described in Oliveira, J. V. C. et al. (2000), Ind. Eng. Chem. Res., v.29, pg. 4627.

[0081] A bulk polymerization means a polymerization process in which the monomers and/or comonomers being polymerized are used as a solvent or diluent using little or no inert solvent as a solvent or diluent. A small fraction of inert solvent might be used as a carrier for catalyst and scavenger. A bulk polymerization system typically contains less than 25 wt% of inert solvent or diluent, preferably less than 10 wt%, preferably less than 1 wt%, preferably 0 wt%.

[0082] Polymerization processes of this invention can be carried out in any manner known in the art. Any suspension, homogeneous, bulk, or solution polymerization process known in the art can be used. Such processes can be run in a batch, semi-batch, or continuous mode. Homogeneous polymerization processes are typically useful, such as homogeneous polymerization process where at least 90 wt% of the product is soluble in the reaction media.) A bulk homogeneous process is also useful, such as a process where monomer concentration in all feeds to the reactor is 70 volume % or more. Alternately, no solvent or diluent is present or added in the reaction medium, (except for the small amounts used as the carrier for the catalyst system or other additives, or amounts typically found with the monomer.).

[0083] Suitable diluents/solvents for polymerization include inert liquids. Examples include straight and branched-chain hydrocarbons, such as isobutane, butane, pentane, isopentane, hexanes, isohexane, heptane, octane, dodecane, and mixtures thereof; cyclic and alicyclic hydrocarbons, such as cyclohexane, cycloheptane, methylcyclohexane, methylcycloheptane, and mixtures thereof, such as can be found commercially (Isopar™ fluids); perhalogenated hydrocarbons, such as perfluorinated C4 0 alkanes, chlorobenzene, and aromatic and alkylsubstituted aromatic compounds, such as benzene, toluene, mesitylene, and xylene. Suitable solvents also include liquid olefins which may act as monomers or comonomers including ethylene, propylene, 1 -butene, 1 -hexene, 1 -pentene, 3-methyl-l -pentene, 4-methyl-l -pentene, 1-octene, 1-decene, and mixtures thereof. In a preferred embodiment, aliphatic hydrocarbon solvents are used as the solvent, such as isobutane, butane, pentane, isopentane, hexanes, isohexane, heptane, octane, dodecane, and mixtures thereof; cyclic and alicyclic hydrocarbons, such as cyclohexane, cycloheptane, methylcyclohexane, methylcycloheptane, and mixtures thereof. In another embodiment, the solvent is not aromatic, preferably aromatics are present in the solvent at less than 1 wt%, preferably less than 0.5 wt%, preferably less than 0 wt% based upon the weight of the solvents. Suitable diluents/solvents for polymerization also include polar, hetero-atom containing liquids such as tetrahydrofuran, dichloromethane, dimethoxyethane.

[0084] In a preferred embodiment, the feed concentration of the monomers and comonomers for the polymerization is 60 vol% solvent or less, preferably 40 vol% or less, or preferably 20 vol% or less, based on the total volume of the feedstream, or preferably no solvent. Preferably the polymerization is run in a bulk process.

[0085] Preferred polymerizations can be run at any temperature and/or pressure suitable to obtain the desired polymers. Typical temperatures and/or pressures include a temperature in the range of from about 0°C to about 300°C, preferably about 20°C to about 200°C, preferably about 35°C to about 150°C, preferably from about 40°C to about 130°C, preferably from about 45°C to about 120°C; and at a pressure in the range of from about 0.35 Mpa to about 10 Mpa, preferably from about 0.45 Mpa to about 6 Mpa, or preferably from about 0.5 Mpa to about 4 Mpa.

[0086] In a typical polymerization, the run time of the reaction is up to 4,320 minutes, preferably in the range of from about 3 to 1,440 minutes, or preferably from about 10 to 240 minutes.

[0087] In an alternate embodiment, the activity of the catalyst is at least 50 g/g of cat, preferably 500 or more g/g of cat, preferably 5,000 or more g/g of cat, preferably 50,000 or more g/g of cat. In an alternate embodiment, the conversion of monomer is at least 5%, based upon polymer yield and the weight of the monomer entering the reaction zone, preferably 10% or more, preferably 30% or more, preferably 50% or more, preferably 80% or more.

[0088] Sequential monomer addition polymerization allows the synthesis of multi-block copolymers that can be used in adhesives, elastomers, and thermoplastics, among other things. [0089] In alternate embodiments, the catalyst complexes descnbed herein may be used to prepare block copolymers, typically diblock and triblock copolymers. This may done by sequential monomer addition to the same catalyst complexes or by sequential polymerization reactions with different catalysts. This may also done by sequential monomer addition to multiple catalyst complexes or addition of new catalyst complexes and monomer in the same or different reaction zones.

[0090] In alternate embodiments, the catalyst complex as described herein can be used in combination with a non-pnictogen-borane catalyst, such as a metal catalyst compound (such as tin 2-ethylhexanoate), to produce block copolymers. For example such metal catalyst compounds can produce telechelic poly-ols of polylactones (such as polycaprolactone) in the first stage of polymerization. The catalysts can then be introduced at the second stage polymerization which enables the copolymerization with epoxides/CCh, COS, CS2. The epoxide can be introduced at either the first or second stage. [0091] In a preferred embodiment, a polymerization reaction for catalyst composition represented by Formula (I):

1) is conducted at temperatures of 0°C to 300°C (preferably 20°C to 200°C, preferably 35°C to 150°C, preferably 40°C to 130°C);

2) is conducted at a pressure of atmospheric pressure to 10 Mpa (preferably 0.35 to 10 Mpa, preferably from 0.45 to 6 Mpa, preferably from 0.5 to 4 Mpa);

3) is conducted in solvent, or may be conducted in neat epoxides (without or with added solvents such as dichloromethane or toluene;

4) the polymerization reaction is preferred to be formed under an inert atmosphere such as nitrogen or argon;

5) occurs in one reaction zone; and

6) has a turnover number for the catalyst composition of 100 or more, (preferably at least 200, preferably at least 500, preferably at least 5,000).

[0092] In a preferred embodiment, the catalyst composition used in the polymerization comprises no more than one catalyst complex. A “reaction zone” also referred to as a “polymerization zone” is a vessel where polymerization takes place, for example a batch reactor. When multiple reactors are used in either series or parallel configuration, each reactor is considered as a separate polymerization zone. For a multi-stage polymerization in both a batch reactor and a continuous reactor, each polymerization stage is considered as a separate polymerization zone. In a preferred embodiment, the polymerization occurs in one reaction zone. Room temperature is 23°C unless otherwise noted.

[0093] Other additives may also be used in the polymerization, as desired, such as one or more scavengers, promoters, modifiers, reducing agents, oxidizing agents, hydrogen, aluminum alkyls, silanes, or chain transfer agents.

Polymer Properties

[0094] Typically, the polymers produced herein have an Mw of 500 to 3,000,000 g/mol (preferably 1,000 to 750,000 g/mol, preferably 10,000 to 500,000 g/mol) as determined by LT THF GPC-1D (see procedure below).

[0095] Typically, the polymers produced herein have an Mw/Mn of greater than 1 to 40 (alternately 1.01 to 20, alternately 1.1 to 10, alternately 1.3 to 5, 1.4 to 4, alternately!.5 to 3), as determined by the GPC methods.

[0096] In a preferred process the polymerization catalysts described herein are used to produce polycarbonate block copolymers. Blends and End Uses

[0097] In another embodiment, the polymer produced herein is combined with one or more additional polymers prior to being formed into an article. Other useful polymers include polyethylene, isotactic polypropylene, highly isotactic polypropylene, syndiotactic polypropylene, random copolymer of propylene and ethylene, and/or butane, and/or hexene, polybutene, ethylene vinyl acetate, LDPE, LLDPE, HDPE, ethylene vinyl acetate, ethylene methyl acrylate, copolymers of acrylic acid, polymethylmethacrylate or any other polymers polymenzable by a high-pressure free radical process, polyvinylchloride, polybutene-1, isotactic polybutene, ABS resins, ethylene-propylene rubber (EPR), vulcanized EPR, EPDM, block copolymer, styrenic block copolymers, polyamides, polycarbonates, PET resins, cross linked polyethylene, copolymers of ethylene and vinyl alcohol (EV OH), polymers of aromatic monomers such as polystyrene, poly-1 esters, poly acetal, polyvinylidine fluoride, polyethylene glycols, and/or polyisobutylene.

[0098] In a preferred embodiment, the polymer is present in the above blends, at from 10 wt% to 99 wt%, based upon the weight of the polymers in the blend, preferably 20 wt% to 95 wt%, even more preferably at least 30 wt% to 90 wt%, even more preferably at least 40 wt% to 90 wt%, even more preferably at least 50 wt% to 90 wt%, even more preferably at least 60 wt% to 90 wt%, even more preferably at least 70 wt% to 90 wt%.

[0099] The blends described above may be produced by mixing the polymers of the invention with one or more polymers (as described above), by connecting reactors together in series to make reactor blends or by using more than one catalyst in the same reactor to produce multiple species of polymer. The polymers can be mixed together prior to being put into the extruder or may be mixed in an extruder.

[0100] The blends may be formed using conventional equipment and methods, such as by dry blending the individual components and subsequently melt mixing in a mixer, or by mixing the components together directly in a mixer, such as, for example, a Banbury mixer, a Haake mixer, a Brabender internal mixer, or a single or twin-screw extruder, which may include a compounding extruder and a side-arm extruder used directly downstream of a polymerization process, which may include blending powders or pellets of the resins at the hopper of the film extruder. Additionally, additives may be included in the blend, in one or more components of the blend, and/or in a product formed from the blend, such as a film, as desired. Such additives are well known in the art, and can include, for example: fillers; antioxidants (e.g., hindered phenolics such as IRGANOXTM 1010 or IRGANOXTM 1076 available from Ciba-Geigy); phosphites (e.g., IRGAFOSTM 168 available from Ciba-Geigy); anti-cling additives; tackifiers, such as polybutenes, terpene resins, aliphatic and aromatic hydrocarbon resins, alkali metal and glycerol stearates, and hydrogenated rosins; UV stabilizers; heat stabilizers; antiblocking agents; release agents; anti-static agents; pigments; colorants; dyes; waxes; silica; fillers; talc; and the like.

[0101] Any of the foregoing polymers and compositions in combination with optional additives (anti-oxidants, colorants, dyes, stabilizers, filler, etc.) may be used in a variety of enduse applications produced by methods known in the art. Exemplary end uses are as articles formed by molding techniques, e.g., injection or blow molding, extrusion coating, foaming, casting, and combinations thereof.

Experimental

GPC Method

[0102] The equipment used is as follows:

Agilent 1260 Infinity II Multi-Detector GPC/SEC System;

Pump - Quaternary Pump (up to four different solvents);

Operation temperature range: 30°C - 60°C; and

Detectors:

• Differential Refractive Index (DRI) detector at 658 nm,

• Viscometer detector (Inlet Pressure and Differential Pressure),

• Light Scattering (LS) detector at 658 nm (dual channel MALS: 90° and 15°), and

• UV Diode Array Detector (Up to eight wavelengths from 190 nm-950 nm).

[0103] All detectors were plumbed in series: UV to Light Scattering to Refractive Index to Viscometer.

[0104] Agilent Multi-Detector GPC/SEC Instrument control and Data Analysis Software Suite was used.

[0105] The chromatographic conditions were as follows:

• Column: 2 x Plgel 5 pm Mixed-C, 7.5 x 300 mm with a Guard column;

• Eluent: Tetrahydrofuran (stabilized with 250 ppm BHT);

• Operation temperature: 40°C;

• Injection volume: 25 pL;

• Run flow rate: 1.0 mL/min; and

• Run time: 36 minutes with 3-minute post run time. [0106] The detectors calibration was performed by using a traceable 50,000 g/mole polystyrene narrow standard. The column calibration was performed by using twenty-three traceable polystyrene narrow standards range from 200 to 4,000,000 g/mole.

Materials

[0107] Cyclohexene oxide (CHO), butylene oxide (BO), propylene oxide (PO), dicholoromethane (DCM), caprolactone (CL), and decalactone (DL) were purchased from Aldrich, and purified by distilling over CaLL under N ₂ . Phenylene dimethanol (PDM) and trans-l,2-dihydroxy cyclohexane (DHCH) were purchased from Aldrich and recrystallized from anhydrous toluene. Methyl caprolactone (MCL) were synthesized according to literature procedures (Macromolecules 2011, v.44, pp. 8537-8545). 9-phosphabicyclononane (isomers) commonly referred to as phobanes was purchased from Strem. Phobane isomers may be separated prior to use as described in J. Am. Chem. Soc. 2009, v.131, pp 3078-3092. 4,8-dimethyl-2-phosabicyclo[3.3.1]nonane (isomers) was purchased from Strem. sym-phobane asym-phobane 4R- 4S- isomers

[0108] Phobane[3.3.1] Phobane [4.2.1]

Examples

[0109] Synthesis: Allyldi-tert-butylphosphane

Allyldi-te/ -butylphosphane (C11H23P). To a Et20 (200 ml) solution of di-te/7- butylchlorophosphane (5.00 g, 27.7 mmol), 1 M Et20 solution of allylbromomagnesium (29. 1 ml, 29. 1 mmol) was slowly added at -20°C. The reaction mixture was then stirred under ambient temperature for 24 hours. The reaction was then quenched by aqueous solution of NH4CI (0.5 ml). After stirring for 30 minutes, the reaction was dried over MgSCL for 30 minutes. All solids were removed by filtration on celite and were washed by hexane. The solvent was removed under vacuo. The product was distilled under vacuum and was obtained as a clear oil (2.65 g, 51%). ‘H NMR (500 MHz, CDCh) 5 6.08 - 5.72 (m, 1H), 5.06 (d, J= 17.0 Hz, 1H), 4.96 (d, J= 9.9 Hz, 1H), 2.40 - 2.14 (m, 2H), 1.14 (d, J= 11.1 Hz, 18H). ¹³ C NMR (126 MHz, CDCh) 5 138.38 (d, J = 16.7 Hz), 115.00 (d, J = 10.9 Hz), 31.61 (d, J = 21.8 Hz), 29.68 (d, J= 13.1 Hz), 26.88 (d, J= 21.0 Hz). ³¹ P NMR (162 MHz, CDCh) 8 28.84.

[0110] Synthesis: (3 -(9-borabicyclo [3 , 3 , 1 ]nonan-9-y l)propyl)di-tert-butylphosphane

(3-(9-borabicyclo[3.3.1]nonan-9-yl)propyl)di-ter7-butylph osphane (C19H38PB). Mix allyldi-tert-butylphosphane (1.27 g, 6.81 mmol) and 9-BBN (0.85 g, 6.95 mmol) in di chloromethane (10 ml) and stir at room temperature for 16 hours. All solvent was then removed under vacuo. The crude product was stirred in pentane (10 ml) for 30 minutes. The pure product (2.10 g, 100%) was obtained by filtration as white solid and was washed by pentane. H NMR (500 MHz, CDCh) 6 2.05 - 1.87 (m, 6H), 1.85 - 1.64 (m, 8H), 1.63 - 1.48 (m, 2H), 1.33 (d, .7 = 1 1.2 Hz, 18H), 1.13 - 1.05 (m, 2H), 0.90 (dt, .7 = 16.6, 6.6 Hz, 2H). ¹³ C NMR (126 MHz, CDCh) 3 34.83 (d, J = 3.6 Hz), 34.17 (d, J= 6.4 Hz), 30.42 (d, J = 3.6 Hz), 26.74, 25.37, 24.52, 22.08 (d, J = 26.0 Hz). ^3I P NMR (162 MHz, CDCh) 6 36.29. ⁿ B NMR (128 MHz, CDCh) 8 11.37.

[0111] Di-ter/-butyl(pent-4-en-l-yl)phosphane (C13H27P). To a THF (10 ml) solution of di-/m-butylphosphane (1.31 g, 8.87 mmol) was added 1.6 M hexane solution of "BuLi (5.77 ml, 9.24 mmol) under -30°C. It was then stirred at room temperature for 30 minutes. The reaction was cooled down to -30°C again and 5 -bromopent- 1-ene (1.47 g, 9.86 mmol) was then added slowly. The mixture was then stirred at room temperature for 16 hours. All solvent was then removed under vacuo. The crude product was stirred in pentane (10 ml) for 30 minutes. The pure product was obtained by vacuum distillation at 90°C to afford a colorless oil. ’l l NMR (500 MHz, CDCh) 8 5.91 - 5.73 (m, 1H), 5.16 - 4.75 (m, 2H), 2.17 (q, J = 1.2 Hz, 2H), 1.63 (q, J= 7.9 Hz, 2H), 1.48 - 1.26 (m, 2H), 1.14 (s, 9H), 1.12 (s, 9H). ¹³ C NMR (126 MHz, CDCh) 6 138.54, 114.73, 35.40 (d, J = 13.4 Hz), 31.17 (d, J = 19.8 Hz), 29.71 (d, J= 25.8 Hz), 29.63 (d, J= 13.3 Hz), 20.45 (d, J= 19.5 Hz). ³¹ P NMR (162 MHz, CDCh) 6 28.38.

[0112] (5-(9-borabicyclo [3.3.1] nonan-9-yl)pentyl)di-tert-butylphosphane

(C2iH42BrPB). Mix di-tert-butyl(pent-4-en-l-yl)phosphane (0.94 g, 4.40 mmol) and 9-BBN (0.55 g, 4.49 mmol) in dichloromethane (10 ml) and stir at room temperature for 16 hours. All solvent was then removed under vacuo. The crude product was stirred in pentane (10 ml) for 30 minutes. The pure product (1.48 g, 100%) was obtained by filtration as yellow solid and was washed by pentane. ’H NMR (500 MHz, CDCh) 6 1.93 - 1.77 (m, 6H), 1.76 - 1.60 (m, 6H), 1.61 - 1.18 (m, 12H), 1.16 (s, 9H), 1.13 (s, 9H). ^3, P NMR (162 MHz, CDCh) 628.77. ⁿ B NMR (128 MHz, CDCh) 6 87.12.

[0113] Di(adamantan-l-yl)(pent-4-en-l-yl)phosphane (C25H39P). To a THF (200 ml) solution of di-tert-butylphosphane (5.00 g, 16.5 mmol) was added 2.5 M hexane solution of "BuLi (6.81 ml, 17.0 mmol) under -30°C. It was then stirred at room temperature for 60 minutes. The reaction was cooled down to -30°C again and a THF (10ml) solution of 5-bromopent-l-ene (2.71 g, 18.2 mmol) was then added slowly. The mixture was then stirred at room temperature for 16 hours. All Solvent was then removed under vacuo. The crude product was stirred in pentane (10 ml) for 30 minutes. The pure product (2.70 g, 44%) was obtained by filtration as white solid and was washed by pentane. ’H NMR (500 MHz, CDCh) 6 5.96 - 5.70 (m, 1H), 5.21 - 4.83 (m, 2H), 2.18 (q, J= 7.2 Hz, 2H), 1.95 (br, 6H), 1.87 (qd, J = 13.5, 12.1, 7.5 Hz, 12H), 1.73 (br, 12H), 1.58 (h, J = 7.9 Hz, 2H), 1.42 - 1.32 (m, 2H). ¹³ C NMR (126 MHz, CDCh) 8 138.74, 114.58, 40.87 (d, J = 10.5 Hz), 37.09, 35.81 (d, J =

20.5 Hz), 35.38 (d, J = 13.3 Hz), 30.32 (d, J = 26.5 Hz), 28.65 (d, J = 7.8 Hz), 16.04 (d, J =

18.6 Hz). ³¹ P NMR (162 MHz, CDCh) 6 25.59. , , , , , , , 8 26. 19. ⁿ B NMR (128 MHz, CDCh) 8 87.55.

Polymerization examples of CO2 and cyclohexene oxide (CHO)

[0115] The polymerization of CO2 and cyclohexene oxide (CHO) were performed in a stainless steel vessel. The catalyst was firstly dissolved in 100 uL epoxide with respective epoxide/catalyst mole ratios. Then, the vessel was pressurized with 450 psi CO2, isolated, and heated at respective temperatures for 12 hours. The reaction was then brought back to ambient temperature and depressurized. The reaction mixture was then dissolved in 1 mL CDCh containing l,3-bis(trimethylsilyl)benzene (5 mM) as an internal standard for quantification. The tune over number (TON), corresponding to numbers of epoxides converted into polymers per catalyst, was determined by ¹ H NMR spectroscopy. The polymers were isolated by drying in a vacuum oven. The molecular weights were determined by GPC methods using dn/dc value of 0.089 mL/g.

Table 1: CO2 and cyclohexene oxide (CHO) polymerization examples.

“Footnote: molecular weight not determined

Polymerization examples of beta-butyrolactone (BBL) [0116] The polymerization of beta-butyrolactone (BBL) were performed in a stainless steel vessel. The catalyst was firstly dissolved in 100 uL epoxide with respective monomer/ catalyst mole ratios. Then, the vessel was isolated and heated at respective temperatures for 12 hours. The reaction was then brought back to ambient temperature. The reaction mixture was then dissolved in 1 mL CDCh containing l,3-bis(trimethylsilyl)benzene (5 mM) as an internal standard for quantification. The tune over number (TON), corresponding to numbers of betabutyrolactone converted into polymers per catalyst, was determined by ^J H NMR spectroscopy. The polymers were isolated by drying in a vacuum oven.

Table 2: beta-butyrolactone (BBL) polymerization examples. aFootnote: molecular weight not determined

Polymerization Examples in the Parr reactors

[0117] Synthesis of poly cyclohexene carbonate (PCHC, EXP-AG8870). To a Parr reactor was charged with Catalyst 2 (133 mg), cyclohexene oxide CHO (40 mL), and trans- 1,2-dihydroxy cyclohexane DHCH (45.9 mg). The reactor was then pressurized with a steadystate CO2 pressure of 500 psi and heated at 90°C for 5 hours. The polymerization was terminated by cooling down to ambient temperatures, followed by the release of CO2. An aliquot was extracted for ’H NMR analysis (CDCh), revealing that 86.5% of cyclohexene oxide was converted into polycyclohexene carbonate. Around 120 mL dichloromethane was added. The mixture was transferred into a large beaker, and all volatiles were removed under reduced pressure at 90°C, yielding a white solid. The solid was further washed with methanol and dried under vacuum at 90°C to give 46 g polymer.

Other Embodiments

[0118] Exemplary polymerization conditions include a polymerization temperature between 100°C and 180°C. [0119] The feed can comprise carbon dioxide at a temperature higher or equal to 31 °C and at a pressure of at least 1,070 psig.

[0120] The oxygen-containing polymer resulting from an exemplary process described above can comprise a polymer with a poly ether content less than 15 wt%, as measured by proton NMR spectroscopy.

[0121] In an exemplary embodiment, the feed can comprise a lactone, wherein the lactone is an enantiomerically enriched chiral lactone, preferably a chiral lactone with an enantiomeric ratio greater than or equal to 60:40.

[0122] In an exemplary embodiment, the oxy gen-containing polymer that results from an exemplary process described above can comprise a polyester with 0. 1 to 2.0 olefinic end groups per polymer chain.

[0123] Exemplary' embodiments described above can further comprise obtaining less than 15 wt% cis and trans crotonic acid as a coproduct.

[0124] All documents described herein are incorporated by reference herein, including any priority documents and/or testing procedures to the extent they are not inconsistent with this text. As is apparent from the foregoing general description and the specific embodiments, while forms of the invention have been illustrated and described, various modifications can be made without departing from the spirit and scope of the invention. Accordingly, it is not intended that the invention be limited thereby. Likewise, the term “comprising” is considered synonymous with the term “including.” Likewise whenever a composition, an element or a group of elements is preceded with the transitional phrase “comprising”, it is understood that we also contemplate the same composition or group of elements with transitional phrases “consisting essentially of,” “consisting of’, “selected from the group of consisting of,” or “is” preceding the recitation of the composition, element, or elements and vice versa.