method of preparing halide-free ionic liquids and thus prepared ionic liquids

摘要

METHOD FOR PREPARATION OF HALOGENIDE-FREE AND INICIUM LIQUIDS LIKE PREPARATIONS The preparation of N-alkyl imidazole with alkyl sulfonates at room temperature affords 1,3-dialkyl imidazolium alkanesulfonates as high yields. The alkane sulfonate anions can be easily substituted by a number of other anions (BF ~ 4 ~, PF ~ 6 ~, PF ~ 3 ~ (CF ~ 2 ~ CF ~ 3 ~) ~ 3 ~, CF ~ 3 ~ SO ~ 3 ~ e (CF ~ 3 ~ SO ~ 2 ~) ~ 2 ~ N by simple reaction of anions, salts, or acids in water at room temperature Extraction with dichloromethane, filtration, and solvent evaporation afford the desired ones. ionic liquids in 80-95% yield The purity of these ionic liquids (in some cases 99.4%) can be determined by the satellite signal intensity ¬13¬C of the magnetic resonance spectra of the N-methyl imidazolium group as an internal standard.