| 摘要 |
Group 4 metal complexes useful as addition polymerization catalysts of the formula: wherein G<SUP>1 </SUP>is a group containing from 1 to 40 atoms not counting hydrogen; T is a divalent bridging group of from 10 to 30 atoms not counting hydrogen, selected from mono- or di-aryl-substituted methylene or silylene groups or mono- or di-heteroaryl-substituted methylene or silylene groups, wherein at least one such aryl- or heteroaryl-substituent is substituted in one or both ortho-positions with a secondary or tertiary alkyl-group, a secondary or tertiary heteroalkyl group, a cycloalkyl group, or a heterocycloalkyl group, G<SUP>2 </SUP>is a C<SUB>6-20 </SUB>heteroaryl group containing Lewis base functionality, M is the Group 4 metal, X'''' is an anionic, neutral or dianionic ligand group, x'''' is a number from 0 to 5, and bonds, optional bonds and electron donative interactions are represented by lines, dotted lines and arrows respectively.
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