Late Transition Metal Complex Catalysts for Olefin Polymerizatian.

This review summarizes the recent developments in the field of olefin polymerization, especially focuses on the topic by nickel, palladium, iron, cobalt, and ruthenium complex catalysts including the brief summary of this research background. A lot of studies have been explored concerning olefin polymerization by nickel and palladium complex catalysts especially after the discovery of α-diimine coordinated nickel and palladium catalysts reported by Brookhart et al., and these results introduce new possibilities for making new type of olefin-based copolymers by these catalysts. In particular, recent discovery concerning ethylene polymerization by iron and cobalt complexes containing 2, 6-bis (imino) pyridine ligand attracted particular attention due to the exceptionally high catalytic activity, and the contents concerning this topic have also been summarized briefly. We also wish to introduce our recent results concerning olefin polymerization by ruthenium and iron complexes-cocatalyst systems.