Polymerization of Methyl Methacrylate by Sterically Modulated Bis(salicylaldiminate)- Cobalt(II) Complexes Combined with Methylaluminoxane

摘要

Kim and coworkers demonstrated that nickel(II) catalysts incorporating α-diimine ligands and iron(II) and cobalt(II) catalysts incorporating tridentate bis-imine ligands produced syndiotactic poly(methyl methacrylate) (PMMA). Groups VI-VIII transition metal derivatives and organoaluminium compounds have been reported to be effective catalysts for the polymerization of various polar vinyl monomers because of their remarkably functional group tolerant and high elec-trophilicities. However, coordinative homo- and copolymer-ization of polar monomers with these transition metals are still one of the challenging topics, because simple coordination of the functional group to the metal may block monomer access to vacant coordination sites.