Living metathesis polymerization of substituted acetylenes by MoOCl4-Et2Zn-EtOH and MoOCl4-n-BuLi systems

被引：21

作者：

Masuda, T ^{[1
]}

Hayano, S ^{[1
]}

Iwawaki, E ^{[1
]}

Nomura, R ^{[1
]}

机构：

[1] Kyoto Univ, Dept Polymer Chem, Kyoto 6068501, Japan

来源：

JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 1998年 / 133卷 / 1-2期

关键词：

metathesis polymerization; living polymerization; molybdenum catalyst; organometallic cocatalyst; substituted acetylene; block copolymerization;

D O I：

10.1016/S1381-1169(98)00098-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Several organometallic compounds were examined as second catalyst components (cocatalysts) of the MoOCl4-cocatalyst(-EtOH) system with the motivation of development of novel catalysts for the Living polymerization of substituted acetylenes. Catalyst systems such as MoOCl4-Et2Zn-EtOH and MoOCl4-n-BuLi have proven to be very effective for the living polymerization of substituted acetylenes. Suitable mole ratios of the catalyst components (MoOCl4:Et2Zn:EtOH = 1:1:3 and MoOCl4:n-BuLi = 1:1) made it possible to achieve Living polymerization of substituted acetylenes including (o-trifluoromethyl)phenylacetylene, (o-trimethylsilyl)phenylacetylene, o-isopropylphenylacetylene, and 1-chloro-1-octyne. Use of anisole instead of toluene as solvent remarkably improved the living nature df polymerization to provide polymers with extremely narrow molecular weight distributions (1.03-1.14) in quantitative yields. Sequential living polymerization of two monomers by these catalyst systems produced block copolymers with low polydispersities without the formation of homopolymers. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：213 / 220

页数：8

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