An efficient procedure is described for the epoxidation of electron-deficient olefins, in particular Vitamin K3 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%), reaction rate and repro- ducibility have been examined. The almost quantitative extraction of the epoxides from the reaction media has been obtained with supercritical CO2. The ionic liquid was then recovered and reused in subsequent cycles.
Sustainable Epoxidation of Electron-poor Olefins with Hydrogen Peroxide in Ionic Liquids and Recovery of the Products with Supercritical CO2.
BORTOLINI, Olga;FANTIN, Giancarlo;FOGAGNOLO, Marco;MAIETTI, Silvia
2003
Abstract
An efficient procedure is described for the epoxidation of electron-deficient olefins, in particular Vitamin K3 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%), reaction rate and repro- ducibility have been examined. The almost quantitative extraction of the epoxides from the reaction media has been obtained with supercritical CO2. The ionic liquid was then recovered and reused in subsequent cycles.File in questo prodotto:
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