期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 56, 期 21, 页码 5774-5779出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201701780
关键词
carbonyl sulfide; epoxide; Lewis pairs; organocatalysis; poly(monothiocarbonate)s
资金
- National Science Foundation of the People's Republic of China [21474083]
- Distinguished Young Investigator Fund of Zhejiang Province [LR16B040001]
- Robert A. Welch Foundation [A-0923]
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.
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