Double-Decker-Type Dinuclear Nickel Catalyst for Olefin Polymerization: Efficient Incorporation of Functional Co-monomers

摘要

The ethylene polymerization and copolymerization of olefins catalyzed by dinuclear transition-metal complexes have recently attracted recent attention. Both early- and late-transition-metal complexes with a dinuclear structure lead to an increase in the molecular weight in ethylene polymerization and in the co-monomer content for the copolymerization of ethylene with various co-monomers. The stabilization of the growing polymer end and coordination of the co-monomer are efficient in the bimetallic system. Marks and co-workers synthesized a planar dinickel complex, which is supported by an aromatic bis(salicylaldimine) ligand (Scheme 1 a), and found that copolymerization of ethylene with functionalized norbornenes and acrylates resulted in greater incorporation of the co-monomers than that with a mononuclear catalyst.