Niobium(<scp>v</scp>) chloride and imidazolium bromides as efficient dual catalyst systems for the cycloaddition of carbon dioxide and propylene oxide
作者:Michael E. Wilhelm、Michael H. Anthofer、Robert M. Reich、Valerio D'Elia、Jean-Marie Basset、Wolfgang A. Herrmann、Mirza Cokoja、Fritz E. Kühn
DOI:10.1039/c3cy01057k
日期:——
The application of niobium(V) chloride and several imidazolium bromides as catalyst systems for the cycloaddition of propylene oxide (PO) with carbon dioxide to propylene carbonate (PC) is reported. A set of 31 different imidazolium bromides has been synthesized with varying substituents at all five imidazolium ring atoms, of which 17 have not been reported before. The impact of different substitution
据报道,氯化铌(V)和几种咪唑鎓溴化物作为催化剂将环氧丙烷(PO)与二氧化碳环加成成碳酸亚丙酯(PC)。合成了31种不同的咪唑鎓溴化物,它们在所有5个咪唑鎓环原子上都有不同的取代基,其中17种以前从未报道过。研究了咪唑环上不同取代方式(空间和电子变化以及在PO中的溶解度)对催化活性的影响。催化剂结构的优化允许在温和的反应条件下以高的反应速率以非常好的收率和对PC的选择性来平衡二氧化碳的价位。