Why propene is not polymerized by (Cp2*YH)2:: reactions of yttrium alkyl complexes with alkenes produce allyl and vinyl yttrium complexes

被引：12

作者：

Casey, CP ^{[1
]}

Tunge, JA ^{[1
]}

Fagan, MA ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Chem, Madison, WI 53706 USA

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2002年 / 663卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

alkene polymerization; termination; allyl complex; vinyl complex;

D O I：

10.1016/S0022-328X(02)01771-0

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Yttrium alkyl complexes (Cp2YR)-Y-* react with C-H bonds of alkenes to form either yttrium allyl complexes or yttrium vinyl complexes. Less substituted alkenes react faster, consistent with prior alkene coordination. The selectivity of the reaction of (Cp2YR)-Y-* with C-H bonds is allylic CH3 much greater than vinyl C-H much greater than allylic CH2. Propene is readily metallated by (Cp2YR)-Y-* giving the eta(3)-allyl complex (Cp2Y)-Y-*(eta(3)-CH2 - CH - CH2) which does not react further with propene. This explains why (Cp2YR)-Y-* (R = alkyl, H) complexes make poor propene polymerization catalysts. (C) 2002 Elsevier Science B.V. All rights reserved.

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收藏

页码：91 / 97

页数：7

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