Sodium Tetrafluoroborate → 1-Butyl-3-methylimidazolium tetrafluoroborate

Participants

Reaction Steps

Methylimidazole and excessive amount of chloro-n-butane (molar ratio: 1/1.05) were reacted at 70° C. with stirring for 48 hours. Excessive of reactants were removed by rotary evaporation, thereby 1-butyl-3-methylimidazolium chloride was obtained. The obtained 1-butyl-3-methylimidazolium chloride was further added into an aqueous solution with excessive amount of sodium tetrafluoroborate (molar ratio: 1/1.1) and stirred for 24 hours. Then, adequate amount of methylene dichloride was added to extract the product. A mixture of the product and the methylene dichloride was washed with water until no chlorine ion was detected by a silver nitrate solution (0.1 mol/L). A product of 1-butyl-3-methylimidazolium tetrafluoroborate was obtained after removing methylene dichloride in the product by rotary evaporation and drying.

Provenance & Evidence