[Cl-].[CH2:2]([N+:6]1[CH:10]=[CH:9][N:8]([CH3:11])[CH:7]=1)[CH2:3][CH2:4][CH3:5].O.[C:13]1(C)[C:14]([S:19]([OH:22])(=[O:21])=[O:20])=[CH:15][CH:16]=[CH:17][CH:18]=1.Cl.O.O1CCOCC1>O1CCOCC1>[S:19]([C:14]1[CH:13]=[CH:18][C:17]([CH3:2])=[CH:16][CH:15]=1)([O-:22])(=[O:20])=[O:21].[CH2:2]([N+:6]1[CH:10]=[CH:9][N:8]([CH3:11])[CH:7]=1)[CH2:3][CH2:4][CH3:5]86.3 g (0.494 mol) of 1-butyl-3-methylimidazolium chloride and 94.9 g (0.499 mol) of toluenesulfonic acid monohydrate are dissolved in 50 ml of 1,4-dioxane at RT. 58 ml of HCl-containing water/dioxane azeotrope are subsequently distilled off at atmospheric pressure (85-101° C). After 22 additional azeotropic distillations with 200 ml of dioxane each time and drying of the distillation residue under reduced pressure at 1.3 Pa and 80° C., 1-butyl-3-methylimidazolium tosylate is obtained. The yield is approximately quantitative.
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