Binuclear chromium-salan complex catalyzed alternating copolymerization of epoxides and cyclic anhydrides
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Liu, Jie
- 通讯作者：
- Lu, XB (reprint author), Dalian Univ Technol, State Key Lab Fine Chem, Coll Chem, 2 Linggong Rd, Dalian 116024, Peoples R China.
- 合写作者：
- Bao, Yuan-Ye,Liu, Ye,Ren, Wei-Min,Lu, Xiao-Bing
- 发表时间：
- 2013-03-07
- 发表刊物：
- POLYMER CHEMISTRY
- 收录刊物：
- SCIE、EI、Scopus
- 文献类型：
- J
- 卷号：
- 4
- 期号：
- 5
- 页面范围：
- 1439-1444
- ISSN号：
- 1759-9954
- 摘要：
- Mono- and bi-nuclear chromium(III)-salan complexes are efficient catalysts for the alternating copolymerization of terminal epoxides [such as epichlorohydrin (CIPO) and glycidyl phenyl ether (GO)] and cyclic anhydrides [e.g. maleic anhydride (MA) and succinic anhydride (SA)] to afford the corresponding copolymers with >99% ester content. The binuclear complex c bearing a binaphthol linker showed significantly higher activity than the mononuclear chromium-salan complexes a and b. For example, the catalytic activities (based on chromium concentration) of complex c for MA/CIPO and MA/GO copolymerizations are 4.1 and 7.1 times that of complex a, respectively. An intramolecular bimetallic synergistic effect, in which the alternating chain-growth and dissociation of propagating copolymer species take turns at the two metal ions of the binuclear catalyst c, was suggested to make a contribution to the enhanced catalytic activity. Importantly, when using the binuclear complex c as a catalyst for MA/(S)-GO copolymerization, a highly regioregular ring-opening step was observed with a concomitant >99% retention of configuration at the methine carbon center of epoxide incorporated into the polyester.
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- 否
