Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 348, Issue 1-2, Pages 243-248Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200505295
Keywords
imidazolium salts; ionic liquids; molten salt; NMR; synthetic methods
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The reaction of N-alkylimidazole with alkyl sulfonates at room temperature affords 1,3-dialkylimidazolium alkanesulfonates as crystalline solids in high yields. The alkanesulfonate anions can be easily substituted by a series of other anions [BF4, PF6, PF3(CF,CF3)(3), CF3SO3 and N(CF3SO2)(2)] by simple reaction of anions, salts, or acids in water at room temperature. Extraction with dichloromethane, filtration through a short basic alumina column and solvent evaporation affords the desired ionic liquids in 80-95% yield. The purity (> 99.4%) of these ionic liquids can be determined by H-1 NMR spectra using the intensity of the C-13 satellites of the imidazolium N-methyl group as internal standard.
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