Highly regio- and stereo-selective copolymerization of CO2 with racemic propylene oxide catalyzed by unsymmetrical (S,S,S)-salenCo(III) complexes
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Ren WeiMin
- 通讯作者：
- Lu, XB (reprint author), State Key Lab Fine Chem, Dalian 116012, Peoples R China.
- 合写作者：
- Zhang WenZhen,Lu XiaoBing
- 发表时间：
- 2010-08-01
- 发表刊物：
- SCIENCE CHINA-CHEMISTRY
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 53
- 期号：
- 8
- 页面范围：
- 1646-1652
- ISSN号：
- 1674-7291
- 关键字：
- 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 reaction. The 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 oxide. The highest record of kinetic resolution coefficient (K-rel) 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.
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- 否
