Dinuclear Bis-Propagators for the Stereoselective Living Coordinative Chain Transfer Polymerization of Propene

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• 作者：Jia Wei ; Wonseok Hwang ; Wei Zhang ; Lawrence R. Sita
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：February 13, 2013
• 年：2013
• 卷：135
• 期：6
• 页码：2132-2135
• 全文大小：254K
• 年卷期：v.135,no.6(February 13, 2013)
• ISSN：1520-5126

文摘

Modulation of steric interactions remote from the active sites within a series of dinuclear bis-propagators derived from racemic 2鈥?b>4 was used to attenuate the rate of reversible chain transfer between active transition-metal centers and excess equivalents of inactive main-group-metal alkyl species relative to chain growth propagation, as a strategy for achieving the stereoselective living coordinative chain transfer polymerization of propene to provide isotactic stereoblock polypropene. Under identical conditions, the corresponding mononuclear propagator derived from racemic 1 produced only atactic polypropene.