Reduced oxidaton state group 4 metal complexes, addition polymerization catalysts, and polymerization process

A metal coordination complex of the formula:

• ##STR7## wherein:
• (a) M is titanium;
• (b) Cp* is selected from the group consisting of indenyl, tetrahydroindenyl, fluorenyl, octahydrofluorenyl, cyclopentadienyl, and R-substituted cyclopentadienyl bound in an .eta..sup.5 bonding mode to M;
• (c) X is, independently each occurrence, an anionic ligand group selected from the group consisting of hydride, halide, alkyl of up to 30 carbon atoms, alkoxy having up to a total of 30 carbon and oxygen atoms, cyanide, azide, acetylacetonate, aryl of up to 30 carbon atoms, aryloxy having up to a total of 30 carbon and oxygen atoms, norbornyl, and benzyl;
• (d) n is 1;
• (e) Y is NR" or PR";
• (f) Z is CR.sub.2 *, CR.sub.2 *CR.sub.2 *, SiR.sub.2 *, or SiR.sub.2 *SiR.sub.2 *;
• (g) R is selected from the group consisting of alkyl having 1 to 20 carbon atoms, cyano, norbornyl, benzyl, aryl of up to 20 carbon atoms, (R').sub.3 Si, and (R').sub.3 Ge;
• (h) R' is selected from the group consisting of C.sub.1 -C.sub.20 alkyl and aryl of up to 20 carbon atoms;
• (i) R" is selected from the group consisting of C.sub.1 -C.sub.20 alkyl, aryl of up to 20 carbon atoms, benzyl, haloaryl having up to a total of 20 carbon and halogen atoms, 2-methoxyphenyl, 4-methoxyphenyl, and norbornyl;
• and
• (j) R* is selected from the group consisting of hydrogen, C.sub.1 -C.sub.20 alkyl, haloalkyl having up to a total of 20 carbon and halogen atoms, aryl of up to 20 carbon atoms, and haloaryl having a total of up to 20 carbon and halogen atoms.

A metal coordination complex corresponding to the formula:

• ##STR8## wherein:
• R' each is independently selected from the group consisting of hydrogen, alkyl, aryl, silyl, germyl, cyano, halo and combinations thereof, said R' having up to non-hydrogen atoms;
• X each occurrence independently is selected from the group consisting of hydride, halo, alkyl, aryl, silyl, germyl, aryloxy, alkoxy, amide, siloxy and combinations thereof, said X having up to 20 non-hydrogen atoms;
• Y is a neutral two electron donor ligand selected from the group consisting of OR*, SR*, NR*.sub.2 and PR*.sub.2 ;
• M is a Group 4 metal;
• n is two;
• and
• Z is SiR*.sub.2, CR*.sub.2, SiR*.sub.2 SiR*.sub.2, CR*.sub.2 CR*.sub.2, CR*=CR*, CR*.sub.2 SiR*.sub.2, GeR*.sub.2, or BR*;
• wherein
• R* each occurrence is hydrogen, alkyl, aryl, silyl, halogenated alkyl, halogenated aryl group, or a mixture thereof, said group having up to 20 non-hydrogen atoms, or two or more R* groups from Y, Z or both Y and Z form a fused ring system.