Stereospecific ring-opening metathesis polymerization of 3-methyl-3-phenylcylopropene by molybdenum alkylidene initiators

被引：34

作者：

Singh, Rojendra ^{[1
]}

Schrock, Richard R. ^{[1
]}

机构：

[1] MIT, Dept Chem 6 331, Cambridge, MA 02139 USA

来源：

MACROMOLECULES | 2008年 / 41卷 / 09期

关键词：

D O I：

10.1021/ma800280q

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The preparation of highly tactic trans-poly 3-methyl-3-phenylcylopropene by ring-opening methathesis polymerization (ROMP), through enantiomorphic site control with molybdenum alkylidene initiators related to those that have been employed for asymmetric metathesis reactions, was reported. A single sharp resonance is observed for the quaternary carbon atom at 46.05 ppm and for the olefinic carbon atom at 137.23 ppm. The nuclear magnetic resonance (NMR) spectrum showed an alkylidene proton in the syn isomer, and initiators contain a broad olefinic proton resonance. The observation of multiple quaternary and olefinic carbon resonance suggest the poly 3-methyl-3-phenylcylopropene samples do not exhibit long-range order. The results also indicate that for an all trans polymer, eight distinct propagation pathways are possible from a single metal center.

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页码：2990 / 2993

页数：4

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