CARBON HYDROGEN AND CARBON CARBON BOND ACTIVATION WITH HIGHLY ELECTROPHILIC TRANSITION-METAL COMPLEXES

被引：44

作者：

BERCAW, JE

机构：

[1] Contribution Number 7964 from the Division of Chemistry, Chemical Engineering, California Institute of Technology, Pasadena

来源：

PURE AND APPLIED CHEMISTRY | 1990年 / 62卷 / 06期

关键词：

D O I：

10.1351/pac199062061151

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Highly electron deficient scandocene derivatives of the types (η5-CsMes5)ScR, {(η5-C5Me4)2SiMe2}ScR and {(η5-C5H3CMe3)2SiMe2}ScR catalyze the polymerization of ethylene, the head-to-tail dimerization of a olefins, the cyclization of a,w dienes to methylene cycloalkanes, and the branching of 1,4 pentadienes to isoprenes. The mechanisms of the individual steps have been studied. Key steps involve sequential and reversible olefin insertion/β H elimination/β alkyl elimination, the last of which is particularly facile in these systems. [{(η5-C5Me4)Me2Si(η-NCMeη)(PMe3)Sc(μ-H)]2, catalyzes the polymerization of a olefins. Evidence is presented in support of a well defined, one component catalyst system with all scandium centers functioning alike. © 1990 IUPAC

引用

页码：1151 / 1154

页数：4

共 7 条

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