Covalently Linked Heterobimetallic Catalysts for Olefin Polymerization

This contribution describes the synthesis and polymerization characteristics of the covalently linked heterobinuclear constrained-geometry polymerization catalyst (μ-CH 2 CH 2 -3,3‘){(η 5 -indenyl)[1-Me 2 Si( t BuN)](TiMe 2 )}{(η 5 -indenyl)[1-Me 2 Si( t BuN)](ZrMe 2 )} ( Ti 1 Zr 1 ). When activated with Ph 3 C + B(C 6 F 5 ) - 4, itis competent to produce long-chain (≥C 6 ) branched polyethylenes in ethylene homopolymerization, in sharp contrast to control experiments with mixtures of analogous but mononuclear Zr and Ti CGC catalysts.