title: Tetravalent metal complexes as a new family of catalysts for copolymerization of epoxides with carbon dioxide.
abstract: New tetravalent metal complexes with a trianionic [ONNO]-tetradentate ligand and an ancillary chloride ligand were synthesized as catalysts for the copolymerization of epoxides with carbon dioxide (CO(2)). All of the titanium, zirconium, germanium, and tin complexes were found to copolymerize epoxides with CO(2). In particular, the copolymerization of propylene oxide with CO(2) gave the almost-completely alternating copolymers by using titanium or germanium complexes. These results are the first example of the copolymerization using tetravalent metal complexes as a main component of catalysts.
authors.affiliation: Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Nakano
authors.forename: Kazuki
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Kyoko
authors.initials: K
authors.lastname: Nozaki