Bicyclo[4.2.0]oct-6-ene-7-carboxamide is a simple but highly strained olefin monomer which forms an alternating copolymer with cyclohexene in the presence of N-heterocyclic carbene-ruthenium catalyst. [4.2.0] moieties with a bulky substituent on C7 that chelate with the ruthenium center of the catalyst propagate more slowly than monomers that cannot chelate. Accordingly, the reactivity ratio of N-propylbicyclo[4.2.0]oct-6-ene-7-carboxamide with cyclohexene is significantly higher than that of N-(2-(2-ethoxyethoxy)ethan)-bicyclo[4.2.0]oct-6-ene-7-carboxamide with cyclohexene. A copolymerization involving the three monomers in a 1 : 1 : 2 (propyl : ethylene glycol : cyclohexene) molar ratio formed a gradient copolymer in a one-pot reaction. Surface hydrophobicity, topology, and thermal properties of the gradient copolymer were similar to those of a copolymer comprised of six microblocks prepared through multistep synthesis by alternately employing the same two bicyclo[4.2.0]oct-6-ene-7-carboxamides in each microblock. The properties of the gradient copolymer were distinct from a copolymer comprised of two larger blocks based on the same bicyclo[4.2.0]oct-6-ene-7-carboxamides.

中文翻译：

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三种单体交替开环复分解制备梯度共聚物

Bicyclo[4.2.0]oct-6-ene-7-carboxamide 是一种简单但高度应变的烯烃单体，在 N-杂环卡宾-钌催化剂存在下与环己烯形成交替共聚物。[4.2.0] 在 C7 上有一个庞大的取代基与催化剂的钌中心螯合的 [4.2.0] 部分比不能螯合的单体传播得更慢。因此， N-丙基双环[4.2.0]辛-6-烯-7-甲酰胺与环己烯的反应率明显高于N-(2-(2-ethoxyethoxy)ethan)-bicyclo[4.2.0]oct-6-ene-7-carboxamide 与环己烯。涉及以 1:1:2 (丙基:乙二醇:环己烯)摩尔比的三种单体的共聚反应在一锅反应中形成梯度共聚物。梯度共聚物的表面疏水性、拓扑结构和热性能类似于由六个微嵌段组成的共聚物，这些微嵌段通过多步合成制备微块。梯度共聚物的性质不同于由基于相同双环[4.2.0]辛-6-烯-7-甲酰胺的两个较大嵌段组成的共聚物。