Alternating Ring-Opening Metathesis Copolymerization by Grubbs-Type Initiators with Unsymmetrical N-Heterocyclic Carbenes
作者:Martin Lichtenheldt、Dongren Wang、Kati Vehlow、Ingrid Reinhardt、Christa Kühnel、Ulrich Decker、Siegfried Blechert、Michaelâ
R. Buchmeiser
DOI:10.1002/chem.200900384
日期:2009.9.21
(NBE) with cis‐cyclooctene (COE) and cyclopentene (CPE), respectively. Alternating copolymers, that is, poly(NBE‐alt‐COE)n and poly(NBE‐alt‐CPE)n containing up to 97 and 91 % alternating diads, respectively, were obtained. The copolymerization parameters of the alternating copolymerization of NBE with CPE under the action of initiators 1–3 and 5–8 were determined by using both a zero‐ and first‐order Markov
基于不对称咪唑啉-2-亚烷基的一系列Ru IV-亚烷基,即[RuCl 2 1-(2,4,6-三甲基苯基)-3-R-4,5-二氢-(3 H)-合成了咪唑-1-亚基}(CHPh)(吡啶)](R = CH 2 Ph(5),Ph(6),乙基(7),甲基(8))。这些和母体引发剂[RuCl 2(PCy 3)1-(2,4,6-三甲基苯基)-3-R--4,5-二氢-(3 H)-咪唑-1-基亚烷基}(CHC 6 H 5)](R = CH 2 C 6 H 5(1),C 6H 5(2),乙基(3))分别用于降冰片2烯(NBE)与顺式环辛烯(COE)和环戊烯(CPE)的交替共聚。交替共聚物,即,聚(NBE- ALT -COE)ñ和聚(NBE- ALT -CPE)Ñ含有高达97和91%交替二单元组,分别获得。NBE与CPE的交替共聚的引发剂的作用下共聚参数1 - 3和5 - 8通过使用零阶和一阶马尔可夫模型来确定。最后,动力学的分析使用引发剂1