A series of allylic substituted cyclopentene monomers with increasing steric bulk are investigated by ring opening metathesis polymerization to understand the effects of these substituents on the microstructural outcomes of the resulting polypentenamers. 3-Triethylsiloxycyclopentene is discovered to polymerize to a highly regular microstructure with up to 96% trans olefins and 92% head-to-tail positional isomers. Dynamic resolution after synthetic modifications produced an enantiopure version (∼92% ee) of this monomer which subsequently produced a precision isotactic and regioregular polypentenamer for the first time. Synthetic investigations, mechanistic aspects, and basic thermal properties are discussed.

中文翻译：

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新型精密五聚体梯队：每五个碳原子上高度等规的分支†

通过开环复分解聚合研究了一系列具有增加的空间体积的烯丙基取代的环戊烯单体，以了解这些取代基对所得聚戊烯单体的微观结构结果的影响。发现3-三乙基甲硅烷氧基环戊烯可聚合成具有多达96％的反式烯烃和92％的头对尾位置异构体的高度规则的微观结构。合成修饰后的动态拆分产生了该单体的对映纯形式（〜92％ee），随后首次产生了精确的等规和区域规则的聚戊烯单体。讨论了综合研究，力学方面和基本的热性能。