期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 22, 页码 8937-8942出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b02722
关键词
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资金
- National Natural Science Foundation of China (NSFC) [21690073]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-17R14]
Herein we report an efficient strategy for preparing isotactic polyesters and chiral epoxides via enantioselective resolution copolymerization of racemic terminal epoxides with anhydrides, mediated by enantiopure bimetallic complexes in conjunction with a nucleophilic cocatalyst. The chirality of both the axial linker and the diamine backbones of the ligand are responsible for the chiral induction of this kinetic resolution copolymerization process. The catalyst systems exhibit exceptional levels of enantiose-electivity with a kinetic resolution coefficient exceeding 300 for various racemic epoxides, affording highly isotactic copolymers (selectivity factors of more than 300) with a completely alternating structure and low polydispersity index. Most of the produced isotactic polyesters are typical semicrystalline materials with melting temperatures in the range from 77 to 160 degrees C.
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