Patent ID: 6040401
Filing Date: 2000-03-21
Classification: C07F,C08F,Y10S

Abstract:
A metal complex corresponding to the formula:L.sub.1 ZL.sub.2 MX.sub.m X'.sub.nwherein:M independently each occurrence is a metal of Group 4 of the Periodic Table of the Elements;L.sub.1 is a partially saturated tricyclic group that is bound to M by means of delocalized .pi.-electrons, said group containing up to 50 nonhydrogen atoms and corresponding to the formula: ##STR6## wherein R.sup.3 independently each occurrence is hydrogen, or a silyl, hydrocarbyl or silyl-substituted hydrocarbyl group of up to 10 nonhydrogen atoms, and each w, independently, is a whole number from 4 to 6;L.sub.2 is a substituted cyclopentadienyl group that is bound to M by means of delocalized .pi.-electrons, said cyclopentadienyl group being substituted at one and only one of its two distal positions with a bulky group, R.sup.4, selected from the group consisting of C.sub.3-20 hydrocarbyl groups bonded to the cyclopentadienyl ring by means of a secondary or tertiary substituted carbon atom, and aryl groups of up to 20 carbons, said L.sub.2 group containing up to 50 nonhydrogen atoms;Z is a divalent substituent bridging L.sub.1 and L.sub.2 of up to 50 non-hydrogen atoms having the formula, --(ER.sup.2.sub.2).sub.m --, wherein E independently each occurrence is carbon, silicon or germanium, R.sup.2 independently each occurrence is selected from the group consisting of hydrocarbyl, hydrocarbyloxy, silyl, and germyl of up to 20 atoms other than hydrogen, and m is an integer from 1 to 3;X each occurrence is a monovalent, anionic moiety having up to 40 non-hydrogen atoms, optionally, two X groups may be covalently bound together forming a divalent dianionic moiety having both valences bound to M, further optionally, 2 X groups may be covalently bound together to form a neutral, conjugated or nonconjugated diene that is bonded to M by means of delocalized .pi.-electrons (whereupon M is in the +2 oxidation state), or still further optionally one or more X and one or more X' groups may be bonded together thereby forming a moiety that is both covalently bound to M and coordinated;m is 1 or 2 and is equal to two less than the formal oxidation state of M, except when 2 X groups together form a neutral conjugated or non-conjugated diene that is .pi.-bonded to M, in which case in is equal to the formal oxidation state of M,X' is a neutral ligand having up to 20 non-hydrogen atoms other than a diene, and optionally X' and L.sub.1 or X' and L.sub.2 are covalently bonded together, and n is a number from 0 to 3.