BACKGROUND OF THE INVENTION Photoresists are organic polymeric materials which find use in a wide variety of applications including use as lithographic imaging materials in semiconductor applications.

For example, there is great interest in developing the next generation commercial 157 nm photoresists for a variety of applications in the semiconductor industry. See Chemical and Engineering News, page 23-24, July 15,2002.

One important property associated with effective photoresists is transparency of the photoresist to light at a given wavelength. Applicants have recognized that although many conventional polymers for optical lithography have demonstrated good performance for use as photoresists at a variety of wavelengths, such polymers nevertheless tend to lack transparency at 157 nm.

For example, U. S. Patent No. 5,821, 036 describes a method of developing positive photoresists and polymer compositions for use therein. While the disclosed polymer compositions are useful in the method of the'036 patent, such compositions tend to be non- transparent and unusable in 157 nm lithographic methods. U. S. Patent No. 6,124, 074 discloses acid catalyzed positive photoresist compositions which tend to be transparent to 193 nm light but not 157 nm light. U. S. Patent No. 6,365, 322 discloses photoresist compositions for deep UV region (100-300 nm) that tend to be non-transparent to 157 nm light.

Prior attempts have been made to produce fluorinated polymers that are substantially transparent to light at wavelengths lower than 194nm, as described above. See, for example,

PCT WO 00/67072 and Hoang et al Macromolecules 2002,35, 6539-6549, and U. S. Patent Nos. 6,468, 712 and 6,486, 282. Although initial screening of these polymers shows promise for transparency at 157 nm, applicants have recognized the need for novel polymers which are not only transparent at 157 nm, but also exhibit resistance to plasma, adhesion to a wide range of substances/surfaces, and exceptional mechanical properties in 157 nm lithography applications. Accordingly, the present invention describes the preparation of novel polymers, as well as novel fluorinated monomers for making such polymers, and methods of using such polymers, including, for example, in 157 nm photoresists.

Each of the documents cited above are herein incorporated in their entirety by reference.

DESCRIPTION OF THE INVENTION AND PREFERRED EMBODIMENTS According to one aspect, the present invention provides novel fluorinated polymers that can be used to great advantage in a number of applications including, for example, in lithographic imaging materials, especially photoresist compositions, as well as, dielectric, passivation and insulating materials, light guides, anti-reflective coatings and layers, pellicles and glues. The preferred polymers of the present invention provide transparency and low optical loss in key areas of the ultraviolet ("UV") and infrared ("IR") spectrum, are sensitive to actinic radiation, and are resistant to the reactive environment associated with ion etching.

Accordingly, such polymers are particularly well suited for use in photoresist applications, as well as other light-sensitive applications. In certain preferred embodiments, the polymers of the present invention comprise one or more repeating units derived from a monomer selected from the group consisting of bicyclic compounds described by Formula I, alkenes described by Formula II, heterocycles described by Formula III and trifluoromethyl-substituted alkynes.

According to another aspect, the present invention provides novel monomer compounds that can be advantageously used to form polymers of the present invention.

According to yet another aspect, the present invention provides novel methods for producing monomer compounds for use in producing the polymers of the present invention.

In certain embodiments, the polymers of the present invention comprise one or more repeating units derived from a monomer described by Formula I, below.

wherein: X is methylene, difluoromethylene, CHRf, C (Rf) 2 oxygen or an R-substituted nitrogen, wherein Rf is a fluorinated alkyl group having from 1 to about 10 carbon atoms, R is hydrogen, unsubstituted or substituted alkyl, unsubstituted or substituted cycloalkyl, unsubstituted or substituted aryl, or unsubstituted or substitued aralkyl ; W is hydrogen, fluorine, or- (CH2) n-CO2R', wherein n is 0 to about 2, R'is a Cl-C5 substituted or unsubstituted alkyl group; and A, B, Y and Z are independently hydrogen, fluorine, alkyl, alkoxy, aryloxy, alkyl ether, ester or alkyl ester groups, wherein said alkyl, alkoxy, alkyl ether, ester or alkyl ester groups may be unsubstituted or further substituted.

R as an alkyl group may be a straight chain or branched molecule, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, n-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, and the like. Additionally, any of these groups may be substituted with halogen, hydroxyl, alkoxy, aryloxy, alkyl, fluoroalkyl, arylalkyl groups, and the like. In a preferred class of alkyls, R is a fluorinated alkyl, and more preferably a Cl to C6 fluorinated alkyl.

R as a cycloalkyl may be, for example, cyclopropyl, cyclobutyl, cyclopentyl, methylcyclopentyl, cylcohexyl, methylcyclohexyl, dimethylcyclohexyl, cycloheptyl, or cyclooctyl. Any of these groups may be substituted with, for example, halogen, hydroxyl, alkoxy, aryloxy, alkyl, fluoroalkyl, arylalkyl groups, and the like. In a preferred class of cycloalkyl, R is a fluorinated cycloalkyl. In a more preferred class of cylcoalkyl, R is a Cg-Cg fluorinated cycloalkyl.

R as an aryl may be, for example, phenyl, o-tolyl, m-tolyl, p-tolyl, o-xylyl, m-xylyl, p-

xylyl, alpha-naphthyl, beta naphthyl, and the like. Any of these groups may be substituted with, for example, halogen, hydroxyl, aryloxy, alkyl, fluoroalkyl, arylalkyl groups, and the like. In a preferred class of aryl, R is a fluorinated aryl.

R as an aralkyl may be, for example, benzyl, 4-methylbenzyl, o-methylbenzyl, p- methylbenzyl, diphenyhnethyl, 2-phenylethyl, 2-phenylpropyl, 3-phenylpropyl, and the like.

Any of these groups may be substituted with, for example, halogen, hydroxyl, aryloxy, alkyl, fluoroalkyl, arylalkyl groups, and the like. In a preferred class of aralkyl, R is a fluorinated aralkyl.

R'as a Cl-Cs substituted or unsubstituted alkyl group may be a straight chain or branched molecule, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert- butyl, n-pentyl, neopentyl, and the like. Additionally, any of these groups may be substituted with halogen, hydroxyl, alkoxy, aryloxy, alkyl, fluoroalkyl, arylalkyl groups, and the like. In a preferred class of alkyls, R is a tert-butyl group.

A, B, Y and/or Z as independently selected alkyl groups may be a straight chain or branched molecules, for example, methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert- butyl, n-pentyl, neopentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, and the like. Additionally, any of these groups may be substituted with halogen, hydroxyl, alkoxy, aryloxy, alkyl, fluoroalkyl, arylalkyl groups, and the like. In a preferred class of alkyls, A, B, Y and/or Z is a fluorinated alkyl or a hydroxy-substituted fluorinated alkyl, including, for example, trifluoromethyl, and-CH2C (CF3) (OH)-CF3.

A, B, Y and/or Z as independently selected alkoxy or aryloxy groups may be any group of the formula-OR"wherein R"is selected independently from, but defined in the same manner above as, R.

A, B, Y and/or Z as independently selected ester or alkyl ester groups may be any group of the formula-(CH2) m-CO2R, wherein m is 0 to about 2, and R is selected independently from, but defined in the same manner above as, R'.

A, B, Y and/or Z as independently selected ether groups may be any group of the formula-R4-O-RS wherein R4and RS are selected independently from, but defined in the same manner above as, R. Additionally, any two or more groups selected from A, B, Y and Z may be combined to form cyclic ether substituents.

Examples of Formula I compounds suitable for use in the present invention include bridged heterocyclic compounds, fluorinated norbornene compounds, and the like. As used herein, the term"bridged heterocyclic compound"refers generally to a compound of the Formula IA, below. wherein X is oxygen or an R-substituted nitrogen, R is defined as above; and W, Y and A are defined as above. Examples of bridged heterocyclic compounds suitable for use in the present invention include compounds of the formula IAI, below. In certain preferred embodiments, the Y group of the compound of formula IA, is hydrogen or fluorine. Examples of such preferred compounds include: 7-azabicyclo [2.2. 1] hept-5-ene-2- (1, 1,1-trifluoro-2-trifluoromethylpropan-2-ol) ; 7- oxabicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2-trifluoromethylpropan-2-ol) ; 4-fluoro-7- oxabicyclo [2.2. 1] hept-5-en-2- (l, 1, 1-trifluoro-2-trifluoromethylpropan-2-ol) ; and the like.

Other bridged heterocyclic compounds suitable for use in the present invention include ester-substituted compounds such as 7-oxabicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1- trifluoro-2-trifluoromethylpropan-2-ol)-1-carboxylic acid tert-butyl ester; and the like.

In certain other preferred embodiments, the compounds of Formula I for use in the present invention comprise fluorinated norbornene compounds. As used herein the term "fluorinated norbornene compound"refers generally to a compound of Formula IB, below.

wherein A, B, Y, and Z are defined as above, provided that: (a) at least one of A, B, Y and Z is fluorine or a group comprising fluorine; (b) when Y, Z, and A are all hydrogen, B is not -CH2C(CF3)2OH or -C(CF3)2OH ; (c) when Y and Z are both hydrogen, and B is trifluoromethyl, A is not-CONH2 ; (d) when Z and A are both hydrogen, and Y is -CO2H, B is not -CH2F, -CHF2, -CF3, -C2F5, or n-C3F7 ; (e) when Z and A are both hydrogen, and Y is -CO2Et, B is not-CF3,-C2Fs, n-C3F7, or n-C7F15 ; (f) when Z and A are both hydrogen, and Y is -CO2Me, B is not n-C3F7 ; and (g) when Z and A are both hydrogen, and Y is -CH2OH, B is not-CF3,-C2Fs, or n-C7F15.

Examples of certain preferred fluorinated norbornene compounds suitable for use in the present invention include compounds described by the formulae IBI, and IB2, below. wherein A and Z are defined as above.

wherein Y and Z are defined as above, provided that when n=l, Y and Z are not both hydrogen.

In certain preferred embodiments, the A and Z groups of formula IBl are independently hydrogen, or fluorine. Examples of such preferred compounds include 3- trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2-trifluoromethylpropan-2-ol), 3- fluoro-3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2-trifluoromethylpropan- 2-ol), 2-fluoro-3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1,1-trifluoro-2- trifluoromethylpropan-2-ol), 2,3-difluoro-3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, l-trifluoro-2-trifluoromethylpropan-2-ol), and the like.

In certain preferred embodiments, the Y and Z groups of formula IB2are independently trifluoromethyl, hydrogen, or fluorine. Examples of such preferred compounds include 2-methylpropyl 2, 3- (bis-trifluoromethyl)-bicyclo [2.2. 1] hept-5-ene-2-carboxylate, 2- methylpropyl 2-trifluoromethyl-bicyclo [2.2. 1] hept-5-en-2-yl-acetate, 2-methylpropyl 2- trifluoromethylbicyclo [2.2. 1] hept-5-en-2-yl-propionate, 2-methylpropyl 3,3-difluoro-2- trifluoromethyl-bicyclo [2.2. 1] hept-5-en-2-yl-acetate, and the like.

Other preferred fluorinated norbornene compounds include cyclic ether compounds such as 2,2-bis (trifluoromethyl)-4- (bicyclo [2.2. 1] hept-5-enyl)-1, 3-dioxolane, and the like; and trifluoroalkoxynorbornenes of the formula IB3, below.

wherein R"is defined as above.

In certain other embodiments, the polymers of the present invention comprise one or more repeating units derived from a monomer described by Formula II, below. wherein A, B, Y and Z are defined as above. Examples of suitable alkenes of formula II for use in the present invention include those of Formulae IIA, below. wherein A, B and Z are as defined above.

In certain preferred embodiments, the compounds of formulae IIA comprise A, B, and Z groups wherein A and Z are independently hydrogen or fluorine, and B is hydrogen or trifluoromethyl. Examples of such preferred compounds include 1, 1, 1, 6,6, 6-hexafluoro-2- (trifluoromethyl) -hex-4-en-2-ol, 1,1, 1, 5,6, 6, 6-heptafluoro-2- (trifluoromethyl)-hex-4-en-2-ol, 1,1, 1,4, 6,6, 6-heptafluoro-2- (trifluoromethyl)-hex-4-en-2-ol, 1,1, 1,4, 5,6, 6,6-octafluoro-2- (trifluoromethyl) -hex-4-en-2-ol, and the like. Other preferred compounds include bis (trifluoromethyl) allylcarbinol, and the like.

Examples of other suitable alkenes of formula II include compounds of formula IIB, below.

wherein A, B, m and R"'are defined as above. In certain embodiments of IIB, A and B are preferably, independently hydrogen, fluorine, or trifluoromethyl. Examples of such compounds of formula HB for use in the present invention include 2-methylpropyl 4,4, 4- trifluoro-2- (trifluoromethy)-but-2-enoate, 2-methylpropyl 3- (trifluoromethyl) but-3-enoate, 2- methylpropyl 4- (trifluoromethyl) pent-4-enoate, 2-methylpropyl 4,4-difluoro-3- (trifluoromethyl) but-3-enoate, 2-methylpropyl 5, 5-difluoro-4- (trifluoromethyl) pent-4-enoate, and the like.

Examples of other formula II alkenes suitable for use in the present invention include 1,1, 1,4, 4,4-hexafluorobut-2-ene, 1- (substitutedhydroxy)-1, 2,2-trifluoroethene, 2,2- bis (trifluoromethyl) -4-methylene-1, 3-dioxolane, 1,1, 1,4, 4,4-hexafluorobut-2-ene, 1- (substituted alkoxy) -1, 2, 2-trifluoroethene, 2,2-bis (trifluoromethyl) -4-methylene-1,3- dioxolane and the like.

In certain other embodiments, the polymers of the present invention comprise one or more repeating units derived from a heterocyclic monomer described by Formula III, below. wherein X and W are as defined above. Examples of suitable heterocyclic monomers of formula III include 1-substituted pyrrole, furan, 2-fluorofuran, 2-furoic acid, and the like.

In certain other embodiments, the polymers of the present invention comprise one or more repeating units derived from a trifluoromethyl-substituted alkynes. As used herein the term"trifluoromethyl-substituted alkyne"refers to a linear, cyclic, or bicyclic alkyne compound comprising at least one trifluoromethyl substitutent. Suitable trifluoromethyl- substituted alkynes include, for example, 1, 1, 1, 4,4, 4-hexafluorobut-2-yne, 2, 3- (bis- trifluoromethyl) -bicyclo [2.2. 1] hept-2,5-diene, and the like.

In certain embodiments, the polymers of the present invention comprise repeating units that are derived from one or more compounds selected from within only one of the types

of monomer compounds, i. e. , only bicyclic compounds described by Formula I, only alkenes described by Formula II, only heterocycles described by Formula III, or only trifluoromethyl- substituted alkynes, of the present invention. In such embodiments, the polymer may be a homopolymer, comprising repeating units all derived from the same compound, or the polymer may comprise two or more repeating units derived from two or more different bicyclic compounds described by Formula I, two or more different alkenes described by Formula II, two or more different heterocycles described by Formula III, or two or more different trifluoromethyl-substituted alkynes.

In certain other embodiments, the repeating units of the present polymer are derived from a plurality of compounds of the instant invention, at least two of which are from different types of monomers of the invention. Such compositions may be copolymers, block copolymers, terpolymers, polymers comprising four or more different classes of repeating units, combinations of two or more thereof, and the like.

In yet other embodiments, the polymer of the present invention may include one or more repeating units derived from other monomers, oligomers, or polymer compounds that have been copolymerized with at least one bicyclic compound described by Formula I, alkene described by Formula II, heterocycle described by Formula III, or trifluoromethyl-substituted alkyne, of the present invention. Suitable other monomers, oligomers, and polymer compounds include, for example, ethylenically unsaturated compounds, especially those containing at least one fluorine substituent. Preferred ethylenically unsaturated compounds include those defined by the formulae: CF3CH=CF2 ; CF3CH=CHF ; CF3CF=CHF ; CF3CF=CH2 ; and Rf (CH2) pCXf=CfYf wherein p is from 0 to about 20; Rf is a perfluoroalkyl group having from about 1 to about 10 carbon atoms, Xf and Yf are independently H or F, provided that when Rf is CF3and Xf is F, Yf must be H.

The polymers of the present invention are prepared by polymerizing one or more compounds selected from the group consisting of bicyclic compounds described by Formula I, alkenes described by Formula II, heterocycles described by Formula III, trifluoromethyl- substituted alkynes, and combinations of two or more thereof, optionally in the presence of any additional monomer compounds to be copolymerized therewith. Any of a wide range of known methods for polymerizing the present compounds can be used according to the present

invention. For example, the monomer compounds may be polymerized via exposure to light or heat and/or through the use of a catalyst. In certain embodiments, the polymers of the present invention are prepared by polymerizing a reaction mixture containing the monomer compounds to be polymerized and a single or multicomponent metal catalyst system as disclosed in the published patent application WO 97/33198 (assigned to B. F. Goodrich and incorporated herein by reference. ) The polymers of the present invention can also be prepared, for example, using nickel or palladium catalysts as disclosed in Risse, Makromol Chem., Rapid Commun. , vol. 12, pages 255-259 (1991), and Hung, Proceedings of SPIE, vol.

4345, pages 385-395 (2001), both of which are incorporated herein by reference. In light of the disclosure herein and the cited documents, those of skill in the art will be readily able to produce polymers of the present invention without undue experimentation.

Uses of the Polymers The polymers of the present invention have utility in a wide range of applications.

For example, one embodiment of the present invention relates to the use of the present polymers in photoresist compositions. The polymers of the present invention preferably exhibit beneficial transparency characteristics for a range of UV irradiation, most notably at about 157 nanometers, and/or other characteristics that make them particularly suitable for use in photoresist applications.

In certain embodiments, the photoresist compositions of the present invention comprise a polymer of the present invention. In certain other embodiments, the photoresists of the present invention further comprise a solvent and a photoinitiator (for example, a photosensitive acid generator). Any of a wide range of solvents are suitable for use in the photoresist compositions of the present invention. For example, any of the solvents disclosed in published patent application WO 97/33198 may be used herein. Any of a wide range of photoinitiators are suitable for use in the present photoresist compositions. Examples of suitable photoinitiators include those disclosed in published patent application WO 97/33198.

In certain embodiments, the photoinitiator is preferably present in an amount of from about 1 to about 100 w/w % to polymer. More preferably the photoinitiator is present in an amount of about 5 to about 50 w/w %.

In certain embodiments, the photoresist compositions of the present invention further comprise a dissolution inhibitor. Any of a wide range of known dissolution inhibitors can be used in the practice of the present invention. For example, t-butyl cholate and the like may be used as a dissolution inhibitors in the present photoresist compositions. Any suitable amount of dissolution inhibitor can be used. Preferably, the dissolution inhibitor is used in an amount of up to about 20 weight % of the photoresist composition.

In certain embodiments, the photoresist compositions of the present invention further comprise a sensitizer capable of sensitizing the photoinitiator to longer wavelengths ranging from mid-UV to visible light. Examples of suitable sensitizers are disclosed in WO 97/33198, and U. S. Patent Nos. 4,250, 053; 4,371, 605; and 4,491, 628, all of which are incorporated herein by reference.

The photoresist compositions of the present invention can be used to generate a positive tone resist image on a substrate. The present invention provides a method for generating a positive tone resist image on a substrate comprising the steps of (a) coating a substrate with a film comprising a photoresist composition of the present invention, (b) imagewise exposing the film to radiation, and (c) developing the image. The coating, radiating and developing steps can be performed using known techniques. For example, the procedures described in application WO 97/33198 can be adapted for use in the present invention. In light of the disclosure contained herein, those of skill in the art would be readily able to generate a positive resist image according to the methods of the present invention.

The present invention also relates to an integrated circuit assembly, such as an integrated circuit chip, multichip module, or circuit board made by the process and/or using the polymers of the present invention. The integrated circuit assembly preferably comprises a circuit formed on a substrate by the steps of (a) coating a substrate with a film comprising a photoresist composition of the present invention, (b) imagewise exposing the film to radiation, (c) developing the image to expose the substrate, and (d) forming the circuit on the substrate. Any of a wide range of known techniques, including those described in application WO 97/33198, can be adapted for use in the methods of the present invention.

The present polymers also find use as dielectric, passivation and insulating materials, light guides, anti-reflective coatings and layers, pellicles, glues and the like.

Method for Making Monomer Compounds The present invention further provides efficient methods for producing a wide variety of bicyclic compounds described by Formula I, and alkenes described by Formula II in accordance with the present invention.

For example, according to certain embodiments, the present invention provides for the preparation of bicyclic compounds via the reaction scheme (Scheme 1) shown below.

Scheme 1

Scheme 1 Con't

Scheme 1 Compounds Compound 1: 1-substituted pyrrole Compound 2: bis (trifluoromethyl) allylcarbinol Compound 3: 7-azabicyclo [2.2. 1] hept-5-ene-2- (l, 1, 1-trifluoro-2-trifluoromethylpropan-2-ol) Compound 4: furan Compound 5: 7-oxabicyclo [2.2. 1] hept-5-ene-2- (l, l, l-trifluoro-2-trifluoromethylpropan-2-ol) Compound 6: 2-fluorofuran Compound 7: 4-fluoro-7-oxabicyclo [2.2. 1] hept-5-ene-2- (1, 1,1-trifluoro-2- trifluoromethylpropan-2-ol) Compound 8: 2-furoic acid Compound 9: 1, 1, 1, 4,4, 4-hexafluorobut-2-ene Compound 10: 7-oxabicyclo [2.2. 1] hept-5-ene-2- (l, l, l-trifluoro-2-trifluoromethylpropan-2- ol)-l-carboxylic acid tert-butyl ester Compound 11: 1- (substitutedhydroxy)-1, 2, 2-trifluoroethene Compound 12: 3,4, 4-trifluoro-3- (substitutedhydroxy)-bicyclo [2.2. 1] hept-5-ene Compound 13: 2,2-bis (trifluoromethyl)-4-methylene-1, 3-dioxolane Compound 14: 2,2-bis (trifluoromethyl)-4- (bicyclo [2.2. 1] hept-5-enyl)-1, 3-dioxolane Compound 23: 2-methylpropyl 4,4, 4-trifluoro-2- (trifluoromethy)-but-2-enoate Compound 24: 2-methylpropyl 2, 3- (bis-trifluoromethyl)-bicyclo [2.2. 1] hept-5-ene-2- carboxylate Compound 25: 1, 1, 1, 4,4, 4-hexafluorobut-2-yne Compound 26: 2, 3- (bis-trifluoromethyl)-bicyclo [2.2. 1] hept-2,5-diene As shown in scheme 1, a variety of bicyclic compounds of the present invention are prepared by reacting a diene with a reactive alkene or alkyne compound under Diels-Alder conditions to form a bicyclic compound. A variety of dienes for use in the present invention are commercially available, including, for example, Compounds 1, 4, and 8 (available from Aldrich Chemical Co. ) ; or are known in the literature and are obtainable by art-recognized procedures (compound 6 may be produced, for example, by lithiation of 2-bromofuran with n-butyl lithium followed by fluorination with N-fluorobenzenesulfonamide.) In addition,

reactive alkenes and alkynes, including compounds 2,9, 11,13, 23 and 25 are obtainable by art-recognized procedures (see, for example, Okamoto, J. Poly. Sci. Pt. A. Polym. Chem., 31, 2573 (1993); Hazeldine, J. Chem. Soc., 2504 (1952); Dyatkin, Zh. Org. Khim., 3, 1006 (1967); Hung, J. Fluorine Chem., 52, 159 (1991) ; Dolbier, J. Org. Chem., 63, 9486 (1998); and Chambers, J. Fluorine Chem., 79, 121 (1996), all of which are incorporated herein by reference.) Any suitable set of reaction conditions can be used in the practice of the present invention. Temperature, time, and pressure conditions of Diels-Alder reactions are known.

The particular set of reaction conditions used in any given reaction will depend on the particular reactants and catalyst used and the time and yield of product desired. Examples of suitable reaction conditions that can be adapted for use herein are disclosed in J. March, Advanced Organic Chemistry, pages 839-856 (Fourth Ed. 1992), incorporated herein by reference.

According to certain other embodiments, the present invention provides for the preparation of alkenes of formula II and fluorine-substituted norbornene compounds via the reaction schemes 2 and 3 shown below.

Scheme 2 Scheme 2 Compounds Compound 15: 1, 1, 1, 6,6, 6-hexafluoro-2- (trifluoromethyl)-hex-4-en-2-ol Compound 16: 3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2- trifluoromethylpropan-2-ol) Compound 17: 1,1, 1,5, 6,6, 6-heptafluoro-2- (trifluoromethyl)-hex-4-en-2-ol Compound 18: 3-fluoro-3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2- trifluoromethylpropan-2-ol) Compound 19: 1,1, 1,4, 6,6, 6-heptafluoro-2- (trifluoromethyl)-hex-4-en-2-ol Compound 20: 2-fluoro-3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1,1-trifluoro-2- trifluoromethylpropan-2-ol) Compound 21: 1,1, 1,4, 5,6, 6, 6-octaafluoro-2- (trifluoromethyl)-hex-4-en-2-ol

Compound 22: 2,3-difluoro-3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2- trifluoromethylpropan-2-ol) As shown in scheme 2, the present method is flexible insofar as it allows for the preparation of any of the compounds described by formulae 15-22, and can be adapted to prepare other, similar compounds of Formulae I and II of the present invention. For example, starting with an alkene compound 3 la-d and the initial bromination step shown in Scheme 2, any one or more sequential reaction steps shown in Scheme 2 can be combined according to, the present method to make compounds of the formulae 15-22. The present methods encompass any of the novel combinations of sequential steps shown in Scheme 2 to produce any compounds described by formulae 15-22, or other, similar compounds of Formula I and Formula II.

Preferably, the bromination step of Scheme 2 comprises reacting an hydroxyl- substituted alkene with a brominating agent to form a brominated alkene. Syntheses of allyl alcohols, such as those of formulae 31a-d, are described in the U. S. application Serial No.

60/358,592, which is incorporated herein by reference (and to which priority is claimed).

As used herein, the term"brominating agent"refers generally to any reagent that can be reacted with an hydroxyl-substituted alkene to form a brominated alkene. Any of a number of brominating agents can be used in the method according to the present invention.

Examples of suitable brominating agents and conditions for bromination are disclosed in Agnew. Chem. Engl., 36,980, (1997), incorporated herein by reference. A preferred esterification agent is phosphorus tribromide.

The second step illustrated in Scheme 2 is a Grignard-type reaction. In general, reaction of a brominated alkene with hexafluoroacetone (HFA) under standard Grignard conditions produces trifluorohexenols, such as those of formulae 15,17, 19,21, as well as other related compounds of the present invention.

The third step in Scheme 2 is a Diels-Alder reaction. Any suitable set of reaction conditions can be used in step 3. Temperature, time, and pressure conditions of Diels-Alder reactions are known. The particular set of reaction conditions used in any given reaction will depend on the particular reactants and catalyst used and the time and yield of product desired.

Examples of suitable reaction conditions that can be adapted for use herein are disclosed in J.

March, Advanced Orgahic Claemistry, pages 839-856 (Fourth Ed. 1992), incorporated herein by reference. Scheme CF3 3 Grignard Conditions CF3 X2C/\Br Br-(CH2) nCO2t-Bu/j\ X2C (CH2) nC02t-Bu 31 X=H _33 n=1 32 X=F 34 n=2 27 X=H, n=1 35 X=H, n=2 /29 X=F, n=1 36 X=F, n=2 x x X CF3 28 X=H, n=1 (CH2) nCO2t-Bu 37 X=H, n=2 30 X=F, n=1 38 X=F, n=2 Scheme 3 Compounds Compound 27 (n=l) : 2-methylpropyl 3- (trifluoromethyl) but-3-enoate Compound 35 (n=2) : 2-methylpropyl 4- (trifluoromethyl) pent-4-enoate Compound 28 (n=l) : 2-methylpropyl 2-trifluoromethyl-bicyclo [2.2. 1] hept-5-en-2-yl-acetate Compound 37 (n=2) : 2-methylpropyl 2-trifluoromethylbicyclo [2.2. 1] hept-5-en-2-yl- propionate Compound 29 (n=l) : 2-methylpropyl 4, 4-difluoro-3- (trifluoromethyl) but-3-enoate Compound 36 (n=2) : 2-methylpropyl 5, 5-difluoro-4- (trifluoromethyl) pent-4-enoate Compound 30 (n=l) : 2-methylpropyl 3, 3-difluoro-2-trifluoromethyl-bicyclo [2.2. 1] hept-5-en- 2-yl-acetate

Compound 38 (n=2) : 2-methylpropyl 3,3-difluoro-2-trifluoromethyl-bicyclo [2.2. 1] hept-5-en- 2-yl-propionate The first step illustrated in Scheme 3 comprises reacting a brominated alkene with a bromoalkylester to produce an alkyl-ester substituted alkene including those of formulae 27, 35,29 and 36, as well as other compounds of the present invention. Brominated alkenes such as those of formulae 31 and 32 are available commercially (compound 31, for example, can be purchased from SynQuest Labs); and/or are obtainable by art-recognized procedures (compound 32 may be produced, for example, according to procedures described in Henne, J.

Am. Chem. Soc., 73,1042 (1951), which is incorporated herein by reference. ) In addition, bromoalkyl esters, such as compounds 33 and 34, are available commercially (for example, from Aldrich).

Any suitable reaction conditions can be used in the first step of Scheme 3. The particular set of reaction conditions used in any given reaction will depend on the particular reactants and catalyst used and the time and yield of product desired. Examples of suitable reaction conditions that can be adapted for use herein are disclosed in Hu, J. Chem. Soc.

Comm., page 289 (1994) and Xu, J. Org. Chem., 56, page 7336 (1991), both of which are incorporated herein by reference.

The second step in Scheme 3 is a Diels-Alder reaction. Any suitable set of reaction conditions as disclosed above can be used.

The compounds obtained from any of the aforementioned individual reactions of any of the reaction schemes may be purified by conventional methods known to those skilled in the art. For example, aqueous washes, drying, concentrating under reduced pressure, distillation, and the like may be used.

In light of the above disclosure, those of skill in the art will be readily able to select appropriate reagents and optimize reaction conditions for each of the reaction steps described above without undue experimentation.

EXAMPLES

In order that the invention may be more readily understood, reference is made to the following examples which are intended to be illustrative of the invention, but are not intended to be limiting in scope.

Example 1 This example illustrates the preparation of 2- (7-Aza-bicyclo [2.2. 1] hept-5-en-2- ylmethyl)-1, 1, 1, 3,3, 3-hexafluoro-propan-2-ol according to the present invention.

To an autoclave is charged pyrrole (67g, 1 mol), allylhexafluoroisopropanol (208g, 1 mol) and hydroquinone (1 lg, 0.1 mol) to form a reaction mixture. The reaction mixture is reacted at O. lkbar and 50°C for 40h. The product is then separated by distillation from unreacted starting materials to yield 97g (35%) (bp 100-110°C/0. lmm) of product.

Example 2 This example illustrates the preparation of 1, 1, 1, 3,3, 3-hexafluoro-2- (7-methyl-7-aza- bicyclo [2.2. 1] hept-5-en-2-ylmethyl) -propan-2-ol according to the present invention.

This compound is prepared according to the procedure described in example 1 except that N-methyl pyrrole is substituted for pyrrole. Yield of product is 61g (21%) mp=70-76°C.

Example 3 This example illustrates the preparation of 1, 1, 1, 3,3, 3-hexafluoro-2- (7-oxa- bicyclo [2.2. 1] hept-5-en-2-yhnethyl)-propan-2-ol according to the present invention.

This compound is prepared following the procedure described in Example 1 except that furan is substituted for pyrrole. Yield of product is 117g (42%) mp 53-59°C.

Example 4 This example illustrates the preparation of 2,3-Bis-trifluoromethyl-7-oxa- bicyclo [2.2. 1] hept-5-en-2-carboxcylic acid tert-butyl ester according to the present invention.

To an autoclave is charged furan (13.6g, 0.2 mol), 4,4, 4-trifluoro-2-trifluoromethyl- but-2-enoic acid tert-butyl ester (10.6g, 0.2 mol) and hydroquinone (lg, 9mmol). The reactor

is heated to 100°C for 96h to form product. Yield of the product is 7.9g (12%) with an mp =90-97°C.

Example 5 This example illustrates the preparation of 2- (2, 3-difluoro-3-trifluoromethyl- biciclo [2.2. 1] hept-5-en-2-ylmethyl)-1, 1, 1, 3,3, 3-hexafluoro-propan-2-ol according to the present invention.

To an autoclave is charged cyclopentadiene (13.2g, 0. 2mol), 1,1, 1,3, 4,5, 5,5- octafluoro-2-trifluoro-pent-3-en-2-ol (62g, 0.2 mol), and hydroquinone (0. lg, 0.9mmol). The autoclave is heated at 180-190°C for 40h to form a product reaction mixture. The product is obtained by extracting the reaction mixture with 10% NaOH solution and washing with hexane. The aqueous layer is acidified with 6N HC1, phase separated, dried and low boiling components removed by evaporation. Yield of product isl5g (20%) with a mp=68-75°C.

Example 6 This example illustrates the preparation of 2, 3-Bis-trifluoromethyl-bicyclo [2.2. 1] hept- 5-en-2-carboxylic acid tert-butyl ester according to the present invention.

This compound is prepared by following the procedure described in Example 5 except that 4,4, 4-trifluoro-2-trifluoromethyl-but-2-enoic acid tert-butyl ester is substituted for the 1,1, 1,3, 4,5, 5,5-octafluoro-2-trifluoro-pent-3-en-2-ol. The product remaining in the organic phase is isolated by removal of the lower boiling components via distillation. Yield of this reaction is 33.7g (51%) with a melting point of 80-85°C.

Example 7 This example illustrates the preparation of 5-tert-Butoxy-5,5, 6-trifluoro- bicyclo [2.2. 1] hept-2-ene according to the present invention.

This compound is prepared by following the procedure as described in example 6 except that 1-tert-butoxy-1, 1, 2-trifluoro ethane is used as the dienophile. Yield of product is 16.7g (38%) with a mp of 35-40°C.

Example 8 This example illustrates the preparation of 1, 1, 1, 5,6, 6,6-heptafluoro-2- trifluoromethyl-hex-4-en-2-ol according to the present invention.

3,4, 4, 4-Tetrafluoro-but-2-en-1-ol (144g, 1 mol) is dissolved in 500mL of ether and treated with PBr3 (270.7g, 1 mol). The conversion to product, based on gc analysis is 77%.

The crude 4-brom-1, 1, 1, 2-tetrafluoro-but-2- ene is reacted in 500mL of ether containing Mg (18. 7g, 0.8 mol). After the formation of the Grignard is complete, the solution is treated with hexafluoroacetone (133g, 0.8 mol) at 0-5°C. The conversion is 68% based on gc analysis.

The product is isolated by distillation. The fraction boiling in the range of 50-55°C/40mm is used directly in the next step.

Example 9 This example illustrates the preparation of 1, 1, 1, 3,3, 3-hexafluoro-2- (3-fluoro-3- trifluoromethyl-bicyclo- [2. 2.1] hept-en-2-ylmethyl) -propan-2-ol according to one embodiment of the present invention.

Cyclopentadiene (13g, 0.2 mol), the alcohol from example 8 (58g, 0.2 mol), and hydroquinone (0. lg, 0. 9mmol) is charged into an autoclave and heated at 170-180°C for 40h.

The resulting crude product is dissolved in 150mL of hexane, then extracted with 10% NaOH solution. The aqueous layer is extracted once with an additional 100mL of hexane. This aqueous layer is acidified with 6N HC1. The organic layer which forms is allowed to phase separate. Low boiling components are removed by distillation to yield the white solid product. Yield: 23.7g (33%); mp=73-78°C.

Example 10 This example illustrates the preparation of 1, 1, 1, 3,3, 3-hexafluoro-2- (3-fluoro-3- trifluoromethyl-bicyclo- [2. 2. 1] hept-en-2-yhnethyl)-propan-2-ol according to another embodiment of the present invention.

The compound 4-brom-1, 1, 1, 2-tetrafluoro-but-2-ene (41.4g, 0.2 mol), prepared as described in Example 8, is reacted with cyclopentadiene (13.2g, 0.2 mol) in an autoclave at 180-190°C for 24h. The intermediate product, 6-bromo-5-fluoro-5-trifluoromethyl-

bicyclo [2.2. 1] hept-2-ene was isolated by vacuum distillation. Yield: 41. 5g (76%); bp=70- 77°C/0. 5mm.

This intermediate is reacted with Mg (4.86g, 0.2 mol) in 100mL of ether. After all of the Mg had reacted, the solution was cooled to-5°C then reacted with hexafluoroacetone (33.2g, 0.2 mol). After the addition was complete, the solution was warmed to 25°C, stirred for 3h, hydrolyzed with 3N HC1, and the organic layer dried over MgS04. The ether was removed by distillation to yield the product, whose structure was confirmed by gc/ms analysis.

Example 11 This example illustrates one embodiment of the present invention involving the polymerization of a norbornene monomer of the present invention to form a polymer of the present invention.

To a 50 mL glass via equipped with a Teflon coated stir bar is added a monomer compound 3-trifluoromethyl-bicyclo [2.2. 1] hept-5-ene-2- (1, 1, 1-trifluoro-2- trifluoromethylpropan-2-ol) (10.3 mmol). The monomer compound is stirred at ambient temperature and to the stirred compound is added a catalyst solution. (The catalyst solution is prepared by adding n3-allylpalladium chloride dimer (38 mg, 0.1 mmol) in 5 mL chlorobenzene to silver hexafluoroantimonate (99 mg, 0.3 mmol) in 5 mL chlorobenzene for 30 minutes and then filtering through a micropore filter to remove precipitated silver chloride). The reaction is allowed to run for 36 hours. After this time, the mixture has gelled to form a clear yellow gel. Upon adding the gel to excess methanol, the polymer precipitates as a white powder. The polymer is washed with excess methanol and dried.