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An ionic liquid was prepared by mixing AlCl3 and 1-methyl-3-butylimidazolium bromide (BMIM) under dry argon atmosphere.Preparation of intermediates 1-methyl-3-butylimidazolium bromide (BMIM)Br.Reaction equation:C4H9Br+[BIM] →[BMIM]Br.Because aluminum chloride ionic liquid is very sensitive to water and oxygen, the operations had to be completed in Ar replacement vacuum glove boxes.Reaction equation: [BMIM]Br + AlCl3 →[BMIM]Br-AlCl3.