溶剂和杂多酸盐中季铵阳离子对环己烯环氧化反应控制相转移催化的影响  

Effects of Solvents and Quaternary Ammonium Ions in Heteropolyoxotungstates on Reaction-Controlled Phase-Transfer Catalysis for Cyclohexene Epoxidation

作　　者：李坤兰[1] 周宁[1] 奚祖威[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《催化学报》2002年第2期125-126,共2页

基　　金：国家自然科学基金资助项目 (2 9673 0 42 )

摘　　要：考察了溶剂和催化剂Q3 [PO4(WO3 ) 4 ]中季铵盐阳离子对环己烯环氧化反应的影响 .在环己烯环氧化反应中 ,以氯仿和叔丁醇为溶剂时 ,环氧化反应的结果最好 .当催化剂中季铵盐阳离子的碳数合适时 ,才能形成反应控制相转移催化过程 .催化剂本身不溶于反应体系 ,但在过氧化氢的作用下形成可溶于反应体系的活性物种 ,均相地催化环氧化反应 .当过氧化氢消耗尽时 。The effects of solvents and quaternary ammonium ions in Q 3[PO 4(WO 3) 4] (Q= π C 5H 5NC 16 H 33 ) on epoxidation of cyclohexene with 30%H 2O 2 were investigated. In the epoxidation, chloroform and t butanol gave the best results. On the other hand, only the quaternary ammonium cations with suitable number of carbon atoms could form a reaction controlled phase transfer catalyst. In proper solvents, the initially insoluble catalyst could form soluble active species under the effect of H 2O 2 to lead to homogeneous catalytic epoxidation of olefins. When H 2O 2 was used up, the catalyst returned to its original structure and precipitated from the reaction medium.

关 键 词：溶剂 杂多化合物 季铵阳离子 反应控制相转移催化 环已烯 环氧化 环氧化合物 

分 类 号：O643.3[理学—物理化学]