Sustainable Epoxidation of Electron-Poor Olefins with Hydrogen Peroxide in Ionic Liquids and Recovery of the Products with Supercritical CO2
作者:Olga Bortolini、Sandro Campestrini、Valeria Conte、Giancarlo Fantin、Marco Fogagnolo、Silvia Maietti
DOI:10.1002/ejoc.200300442
日期:2003.12
An efficient procedure is described for the epoxidation of electron-deficient olefins, in particular Vitamin K-3 and analogues, with aqueous basic solutions of hydrogen peroxide in different ambient temperature ionic liquids (ILs) [bmim(+)][X-] [bmim(+)] = 1-butyl-3-methylimidazolium; [X-] = [BF4-], [CF3SO3-], [PF6-] [N(CF3SO2)(2)(-)]}. Various factors affecting epoxide yield (in the range 80-99%)
描述了在不同环境温度的离子液体 (IL) [bmim(+)][X-] 中使用过氧化氢碱性水溶液环氧化缺电子烯烃,特别是维生素 K-3 和类似物的有效程序[bmim(+)] = 1-丁基-3-甲基咪唑鎓;[X-] = [BF4-], [CF3SO3-], [PF6-] [N(CF3SO2)(2)(-)]}。已经检查了影响环氧化物产率(80-99%)、反应速率和再现性的各种因素。用超临界 CO2 从反应介质中几乎定量地提取环氧化物。然后回收离子液体并在随后的循环中重新使用。(C) Wiley-VCH Verlag GmbH & Co.KGaA, 69451 Weinheim, Germany, 2003。