received by the International Bureau on 06 April 2018 (06.04.2018)

1. A phosphaguanidine compound comprising the structure of formula I:

wherein

are independently selected from hydrides, aliphatic moieties, heteroaliphatic

moieties, aromatic moieties, or heteroaromatic moieties, or may include a lone pair of electrons; R⁽ is an aliphatic, heteroaliphatic, aromatic, or heteroaromatic moiety; R¹ and R⁴ include the same or different moieties selected from aliphatic moieties, heteroaliphatic moieties, aromatic moieties, or heteroaromatic moieties and/or may include a lone pair of electrons;

are independently selected from aliphatic moieties, heteroaliphatic moieties, aromatic moieties, or heteroaromatic moieties.

2. The phosphaguanidine compound according to claim 1, wherein one of R² and R⁵ is a lone pair of electrons and the other of R² and R^s is a hydride, aliphatic moiety, heteroaliphatic moiety, aromatic moiety, heteroaromatic moiety; and one of R⁹ and R⁷ is a lone pair of electrons and the other of and R⁷ is a hydride, aliphatic moiety, heteroaliphatic moiety, aromatic moiety, heteroaromatic moiety.

3. The phosphaguanidine compound according to any one of the preceding claims, wherein R is a moiety.

4. The phosphaguanidine compound according to claims 1 to 3, wherein

comprise substituted and un substituted phenyl rings.

5. The phosphaguanidine compound according to claims 1 to 3, wherein , , , comprise

6, The phosphaguanidine compound according to claims 1 to 3, wherein comprise adamantyl groups.

7. The phosphaguanidine compound according to claims 1 to 3, wherein

are independently selected from methyl, ethyl, cyclohexyl, ijo-propyl, wo-butyl, or terr-butyl moieties.

8 The phosphaguanidine compound according to claim 1 , wherein R is a repeating unit, the phosphaguanidine compound of formula II comprising:

wherein

n is an integer from two to six; R¹⁰ is selected from a hydrogen atom, an aliphatic moiety, heteroaliphatic moiety, aromatic moiety, or heteroaromatic moiety;

R^yand R^z include the same or different moieties selected from hydrides, aliphatic moieties.

heteroaliphatic moieties, aromatic moieties, heteroaromatic moieties, or a lone pair of electrons; and wherein, in cases in which n is greater than 1 , there are a plurality of repeating units, and , and R^z may be the same or different within the plurality of repeating units.

9. A metal-ligand complex comprising the phosphaguanidine compound of formula III;

wherein

include the same or different moieties selected from hydride, aliphatic, heteroaliphatic, aromatic, and heteroaromatic moieties;

² include the same or different moieties selected from aliphatic moieties, aromatic moieties, or heteroaromatic moieties;

M is selected from titanium, zirconium, or hafnium; each X is independently selected from aliphatic moieties, aromatic moieties, moieties or halide moieties, wherein R^N is selected from alkyl, aryl, or heteroaryl moieties;

R⁶ is selected from an aliphatic moiety, heteroaliphatic moiety, aromatic moiety, or a heteroatom; and

each dotted line optionally defines a bridging connection.

10. A biphenyl- phosphaguanidine compound comprising the structure of Formula IV:

wherein

are independently selected from hydrides, alkyl groups, aryl or heteroaryl groups, or guanidine moiety;

each phenyl ring comprises at least one guanidine moiety, the guanidine moiety comprising the structure of formula V:

wherein

R^d and R^e are independently selected from hydrides, aliphatic moieties, heteroaliphatic moieties, aromatic moieties, heteroaromatic moieties, and/or may include lone pair of electrons;

R^c is selected irom hydrides, aliphatic moieties, heteroaliphatic moieties, aromatic moieties, heteroaromatic moieties and/or lone pairs of electrons;

R^a and R^b are independently selected from aliphatic moieties, heteroaliphatic moieties, aromatic moieties, or heteroaromatic moieties; and

each curved dotted line optionally defines a bridging connection,

wherein, in cases where there are a plurality of guanidine moieties, and R^c may be

the same or different within the plurality of guanidine moieties.

1 1. The biphenyl- phosphaguanidine compound according to claim 10, wherein G and G¹¹ include the guanidine moiety of formula IV, and G are hydrogen atoms.

12. The biphenyl- phosphaguanidine compound according to claim 10 or claim 1 1, wherein R' is selected from hydride, adamantyl, tert- butyl, and/or a lone pair of electrons.

13. A polymerization catalyst comprising the biphenyl- phosphaguanidine compound according to claim 10, claim 1 1 , or claim 12 and a transition metal catalyst bonded to the biphenyl- phosphaguanidine compound, wherein the transition metal catalyst comprise hafnium, zirconium, or titanium.

(Original) A phosphaguanidine naphthalene compound comprising the structure of formula

wherein are independently selected from hydrides, alkyl groups, aryl or heteroaryl groups, or alkylguanidine moieties; each phenyl ring comprises at least one guanidine moiety;

the uanidine moiety comprising the structure of formula V:

wherein

include the same or different moieties selected from hydrides, aliphatic moieties, heteroaliphatic moieties, aromatic moieties, heteroaromatic moieties, and/or may include lone pair of electrons;

R^c is selected from hydrides, aliphatic moieties, heteroaliphatic moieties, aromatic moieties, heteroaromatic moieties or lone pairs of electrons; R^a and R^b include the same or different moieties selected from aliphatic moieties, heteroaliphatic moieties, aromatic moieties, or heteroaromatic moieties; and

each curved dotted line optionally defines a bridging connection,

wherein, in cases where there are a plurality of guanidine moieties, may be the same or different within the plurality of guanidine moieties.

15, A polymerization catalyst comprising the phosphaguanidine naphthalene compound of claim 14, and a transition metal catalyst bonded to the phosphaguanidine naphthalene compound, wherein the transition metal catalysts comprise hafnium, zirconium, or titanium.