Efficient Magnesium Catalysts for the Copolymerization of Epoxides and CO2; Using Water to Synthesize Polycarbonate Polyols

被引：255

作者：

Kember, Michael R. ^{[1
]}

Williams, Charlotte K. ^{[1
]}

机构：

[1] Univ London Imperial Coll Sci Technol & Med, Dept Chem, London SW7 2AZ, England

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2012年 / 134卷 / 38期

基金：

英国工程与自然科学研究理事会;

关键词：

CARBON-DIOXIDE; PROPYLENE-OXIDE; ALTERNATING COPOLYMERIZATION; CYCLOHEXENE OXIDE; POLY(PROPYLENE CARBONATE); COBALT(III) COMPLEX; MECHANISM; PRESSURE; SELECTIVITY; CHEMISTRY;

D O I：

10.1021/ja307096m

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The synthesis and characterization of three highly active dimagnesium catalysts for the copolymerization of cyclohexene oxide and carbon dioxide, active under just 1 atm of carbon dioxide pressure, are reported. The catalysts have turnover numbers up to 6000 and turnover frequencies of up to 750 h(-1). These values are, respectively, 75 and 20 times higher than those of the other three known magnesium catalysts. Furthermore, the catalysts operate at 1/500th the loading of the best reported magnesium catalyst. The catalyst selectivities are excellent, yielding polymers with 99% carbonate repeat units and >99% selectivity for copolymer. Using a dimagnesium bis(trifluoroacetate) catalyst, and water as a renewable chain transfer reagent, poly(cyclohexene carbonate) polyols are synthesized with high selectivity.

引用

页码：15676 / 15679

页数：4

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