title: High-activity, single-site catalysts for the alternating copolymerization of CO2 and propylene oxide.
abstract: Despite recent advances regarding catalysts for CO2/epoxide copolymerization, the development of high-activity catalysts for alternating polymerization of CO2 and commodity epoxides, such as propylene oxide, remains a challenge. A new class of unsymmetrically substituted beta-diiminate zinc complexes is reported that exhibits unprecedented activity for CO2/propylene oxide copolymerization. The polymers formed are of high molecular weight (Mn approximately 35 kg/mol) and have narrow polydispersities (PDI approximately 1.1), consistent with a living polymerization.
authors.affiliation: Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853, USA.
authors.forename: Scott D
authors.initials: SD
authors.lastname: Allen
authors.forename: David R
authors.initials: DR
authors.lastname: Moore
authors.forename: Emil B
authors.initials: EB
authors.lastname: Lobkovsky
authors.forename: Geoffrey W
authors.initials: GW
authors.lastname: Coates