Oxygen/Sulfur Scrambling During the Copolymerization of Cyclopentene Oxide and Carbon Disulfide: Selectivity for Copolymer vs Cyclic [Thio]carbonates
作者:Donald J. Darensbourg、Stephanie J. Wilson、Andrew D. Yeung
DOI:10.1021/ma4015438
日期:2013.10.22
was noted upon the addition of the onium salt. Cyclopentene sulfide was observed as a side product of the coupling reaction and was found to be unreactive toward both CS2 and CO2, instead undergoing desulfurization to cyclopentene under the conditions of the reaction. Of the 12 cyclic cyclopentene [thio]carbonates possibly produced by this coupling reaction, eight were observed, and the crystal structure
已经在添加的鎓盐存在下利用(salen)CrCl研究了环戊烯氧化物与二硫化碳的催化偶联。产生了聚合材料和环状材料,在两种情况下均观察到氧/硫原子加扰。发现该原子再分布过程需要(salen)CrCl和过量的环氧化物,尽管在加入鎓盐后注意到原子加扰的速率增加了。环戊烯硫醚被认为是偶联反应的副产物,发现对CS 2和CO 2均无反应。,而不是在反应条件下进行脱硫成环戊烯。在该偶合反应可能产生的12种环状环戊烯碳酸酯中,观察到8种,本文报道了反式-环戊烯三硫代碳酸酯的晶体结构。计算研究表明,顺式物质比反式物质更稳定,焓> 5 kcal / mol,形成C═O和C═S的倍数为10-25 kcal / mol。键。当反式在过量的环戊烯氧化物的存在下将-环己烯三硫代碳酸酯暴露于催化剂体系中,观察到混合物种的加扰,从而产生了同时显示环戊基和环己基骨架的环状[碳酸]碳酸酯化合物。提出的用于原子加扰的机制途径涉