STEREOCHEMICAL NONRIGIDITY IN METALLOCENIUM IONS

被引：51

作者：

SIEDLE, AR

NEWMARK, RA

机构：

[1] 3M Corporate Research Laboratories, St. Paul

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 1995年 / 497卷 / 1-2期

关键词：

METALLOCENIUM IONS; STEREOCHEMICAL NONRIGIDITY; ZIRCONIUM; HAFNIUM;

D O I：

10.1016/0022-328X(95)00114-6

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Dynamic NMR spectroscopy of the MeB(C6F5)(3)(-) salts of a series of ring-substituted zirconium- and hafnium-containing metallocenium ions, exemplified by (RCp)(2)ZrCH3+, reveals two exchange processes. One, having the lower free energy of activation, involves shift of the CH3 group from one lateral equatorial orbital to the other. The second results from exchange between the metal-CH3 and B-CH3 groups. Effects of structural variations on exchange barriers are discussed and related to metallocenium ion-catalyzed olefin polymerization.

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页码：119 / 125

页数：7

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