Highly regio-and stereo-selective copolymerization of CO_2 with racemic propylene oxide catalyzed by unsymmetrical (S,S,S)-salenCo(Ⅲ) complexes

作     者：REN WeiMin,ZHANG WenZhen & LU XiaoBing State Key Laboratory of Fine Chemicals Dalian University of Technology,Dalian 116012,China 

作者机构：1. State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 China 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2010年第53卷第8期

页      面：1646-1652页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070305[理学-高分子化学与物理] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：supported by the National Natural Science Foundation of China (20634040) National Basic Research Program of China (973 Program) (2009CB825300) the Outstanding Young Scientist Foundation of the National Natural Science Foundation of China (20625414) 

主　　题：carbon dioxide propylene oxide polycarbonate stereochemistry asymmetric catalysis polymerization kinetic resolution 

摘      要：A novel unsymmetrical (S,S,S)-salen ligand bearing a derived chiral-BINOL was synthesized by the reaction of the condensation product of (1S,2S)-1,2-diaminocyclohexane mono(hydrogen chloride) with 3-adamanyl-5-tert-butyl-2-hydroxybenzalde-hyde and 3-formoyl-2-hydroxy-2 -alkyloxy-1,1 -binaphthyl,which originated from (S)-1,1 -bi-2-naphthol via a four-step *** cobalt complexes of this ligand,in conjunction with a nucleophilic cocatalyst,exhibited excellent activity in catalyzing asymmetric,regio-and stereo-selective copolymerization of CO2 and racemic propylene *** highest record of kinetic resolution coefficient (Krel) was obtained with the use of binary catalyst system consisting of (S,S,S)-salenCo(III) complex 1c and bulky bis(triphenylphosphine)-iminium chloride (PPNCl).The resulting poly(propylene carbonate)s have more than 99% carbonate linkages and more than 98% head-to-tail content.