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Ring-opening polymerization of norbornene by η-cycloheptatrienyl molybdenum and tungsten complexes

被引：9
|
作者：
Yeung, YO [1 ]
Ng, ACH [1 ]
Ng, DKP [1 ]
机构：
[1] Chinese Univ Hong Kong, Dept Chem, Shatin, NT, Peoples R China
来源：
INORGANICA CHIMICA ACTA | 1999年 / 288卷 / 02期
关键词：
ring-opening polymerization; norbornene; molybdenum complexes; tungsten complexes; cycloheptatrienyl complexes;
D O I：
10.1016/S0020-1693(99)00076-6
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The eta-cycloheptatrienyl complexes [M(eta-C7H7)LI2] (M = Mo, W; L -MeCN, PPh3), activated with Me3SiCH2MgCl catalyze the ring-opening polymerization of norbornene to give high molecular weight, poly(1,3-cyclopentylenevinylene) in high yield. By using the molybdenum complexes essentially all of the double bonds in the resulting polymers are in the trans-configuration as revealed by C-13 NMR spectrometry. The tungsten catalyst [W(eta-C7H7)(MeCN)I-2]exhibits higher reactivity toward this ring-opening polymerization but:lower stereoselectivity in comparison with the molybdenum analogs. (C) 1999 Elsevier Science S.A. All rights reserved.
引用
收藏
页码：226 / 228
页数：3
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