Perfectly Alternating and Regioselective Copolymerization of Carbonyl Sulfide and Epoxides by Metal-Free Lewis Pairs

被引：171

作者：

Yang, Jia-Liang ^{[1
]}

Wu, Hai-Lin ^{[1
]}

Li, Yang ^{[1
]}

Zhang, Xing-Hong ^{[1
]}

Darensbourg, Donald J. ^{[2
]}

机构：

[1] Zhejiang Univ, Dept Polymer Sci & Engn, MOE Key Lab Macromol Synth & Functionalizat, Hangzhou 310027, Zhejiang, Peoples R China

[2] Texas A&M Univ, Dept Chem, College Stn, TX 77843 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2017年 / 56卷 / 21期

基金：

美国国家科学基金会;

关键词：

carbonyl sulfide; epoxide; Lewis pairs; organocatalysis; poly(monothiocarbonate)s; POLYMER SYNTHESIS; SALEN COMPLEXES; PROPYLENE-OXIDE; DIOXIDE; CO2; CATALYSTS; POLYCARBONATES; SELECTIVITY; ACTIVATION; REACTIVITY;

D O I：

10.1002/anie.201701780

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The preparation of perfectly alternating and regioslective copolymers derived from the copolymerization of carbonyl sulfide (COS) and epoxides by metal-free Lewis pair catalysts composed of a Lewis base (amidine, guanidine, or quaternary onium salts) and a Lewis acid (triethyl borane) is described. Colorless and highly transparent copolymers of poly(monothiocarbonate) were successfully obtained with over 99% tail-to-head content and high molecular weight (up to 92.5 kg mol(-1)). In most instances, oxygen-sulfur exchange reactions (O/S ERs), which would generate random thiocarbonate and carbonate units, were effectively suppressed. The turnover frequencies (TOF) of these Lewis pair catalyzed processes were as high as 119 h(-1) at ambient temperature.

引用

页码：5774 / 5779

页数：6

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