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首页> 外文期刊>Chemistry: A European journal >Optically Active, Isotactic Homopolymers of #alpha#-Olefins with Main-Chain Chirality and the First Preparation of Optically Active C_3-Symmetrical Polymers
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Optically Active, Isotactic Homopolymers of #alpha#-Olefins with Main-Chain Chirality and the First Preparation of Optically Active C_3-Symmetrical Polymers

机译：具有主链手性的＃alpha＃-烯烃的旋光等规均聚物和旋光性C_3对称聚合物的首次制备

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摘要

Enantiomerically pure or enriched isotactic poly (methyl methacrylates) of varying molar masses and carrying one reactive amino end group have been prepared from the corresponding poly (trityl methacrylates) and poly (diphenyl-2-pyridylmethyl methacrylates) It was of special interest to investigate the dependence of their chiroptical properties with respect to the chain length. Only at a rather high P_n (P_n > 300), the optical activity becomes negligible, and the polymers can be called cryptochiral. Coupling of three such chains to 1, 3, 5-benzenetricarbonyl chloride results in three-armed star polymers with C_3 symmetry. Their optical rotation is measured as such in solution and after transforming the polymers with achiral syndiotactic poly(methyl methacrylates) into helical stereocomplexes. The polymers, especially the helical stereocomplexes, have remarkably high optical rotations. These compounds are the first optically active polymers with C_3 symmetry.
机译：由相应的聚（甲基丙烯酸三苯甲基酯）和聚（甲基丙烯酸二苯酯-2-吡啶基甲基）酯制备了具有不同摩尔质量并带有一个反应性氨基端基的对映体纯或富集的等规聚甲基丙烯酸甲酯。它们的手性对链长的依赖性。仅在相当高的P_n（P_n> 300）时，光学活性才可忽略不计，这些聚合物可以称为隐手性。三个这样的链与1、3、5-苯三羰基氯的偶合产生具有C_3对称性的三臂星形聚合物。在溶液中以及将具有非手性间同立构的聚甲基丙烯酸甲酯的聚合物转变为螺旋立体络合物之后，测量它们的旋光度。聚合物，特别是螺旋立体复合物，具有很高的旋光度。这些化合物是第一批具有C_3对称性的旋光聚合物。

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