...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Investigations into the coupling of cyclohexene oxide and carbon disulfidecatalyzed by (salen)CrCI. Selectivity for the production of copolymers vs.cyclic thiocarbonates
【24h】

Investigations into the coupling of cyclohexene oxide and carbon disulfidecatalyzed by (salen)CrCI. Selectivity for the production of copolymers vs.cyclic thiocarbonates

机译：（salen）CrCl催化氧化环己烯与二硫化碳偶联的研究。相对于环状硫代碳酸酯生产共聚物的选择性

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The synthesis of poly(thiocarbonates) has been achieved via the (salen)CrC1/[PPN]C1 (salen =N,N'-bis(3,5-di-tert-butylsalicylidene)-1,2-ethylenediamino) and PPN+ = bis(triphenyl-phosphoranylidene)ammonium) catalyzed coupling of carbon disulfide and cyclohexene oxide. Optimalcatalytic activity was observed at 50 C and a 1 : 1 carbon disulfide to cyclohexene oxide loading ratioto afford copolymers with molecular weights ranging from 14 000-34 000 g mol-1 with narrowmolecular weight distributions. The exchange of sulfur and oxygen atoms was observed in both thecopolymer and cyclic products. In situ infrared monitoring of the coupling reactions revealed aninitiation period followed by formation of copolymers enriched in oxygen content, and concomitantlycyclic thiocarbonates enriched in sulfur content. By way of contrast, the copolymerization ofcyclohexene sulfide and carbon disulfide was found to be highly selective and effective for producingcyclohexylene trithiocarbonate vs. the all-sulfur copolymer at 30 °C. Density functional theorycalculations were carried out on the possible cyclic materials from the coupling of cyclohexene oxideand CS2, which revealed cyclohexylene trithiocarbonate to be the most stable cyclic species.
机译：聚（硫代碳酸酯）的合成是通过（salen）CrC1 / [PPN] C1（salen = N，N'-双（3,5-二叔丁基水杨亚基）-1,2-亚乙基二氨基）和PPN + ＝双（三苯基-磷杂亚烷基）铵）催化的二硫化碳和环己烯氧化物的偶联。在50℃和二硫化碳与环己烯氧化物的负载比为1∶1时观察到最佳的催化活性，得到分子量范围为14000-34000g mol-1且分子量分布窄的共聚物。在共聚物和环状产物中均观察到硫和氧原子的交换。对偶联反应的原位红外监测显示了起始阶段，随后形成了富氧含量高的共聚物，以及富硫量含量高的伴随环状硫代碳酸盐。相比之下，发现在30℃下环己烯硫化物和二硫化碳的共聚相对于全硫共聚物是高度选择性的并且对于生产环己烯三硫代碳酸酯而言是有效的。通过环氧乙烷与CS2的偶合，对可能的环状材料进行了密度泛函理论计算，结果表明环己烯三硫代碳酸酯是最稳定的环状物质。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号