Preparation of Novel Ionic Liquids and Their Applications in Brominating Reaction
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Novel acidic ionic liquids, 1-(ω-sulfonicacid)propyl-3-methylimidazolium bromide ([HSO_3pmim]Br)and 1-(ω-sulfonicacid)butyl-3-methylimidazolium bromide ([HSO_3bmim]Br), were prepared and used as brominating agents, catalysts and solvents in the synthesis of 1,7-dibromoheptane, respectively. 1,7-dibromoheptan with a yield of 95% was obtained at 100℃ for 2 h by simple phase separation. The acidic ionic liquid [HSO_3pmim]Br was recycled for 5 times and the yield of 1,7-dibromoheptane did not decrease remarkably, which indicates that catalysts still maintain good selectivity and activity after recycling. The structure of the acidic ionic liquid [HSO_3pmim]Br was characterized with IR, and it was found that [HSO_3pmim]Br had stronger acidity than other ionic liquid.
Abstract
Novel acidic ionic liquids, 1-(ω-sulfonicacid)propyl-3-methylimidazolium bromide ([HSO_3pmim]Br)and 1-(ω-sulfonicacid)butyl-3-methylimidazolium bromide ([HSO_3bmim]Br), were prepared and used as brominating agents, catalysts and solvents in the synthesis of 1,7-dibromoheptane, respectively. 1,7-dibromoheptan with a yield of 95% was obtained at 100℃ for 2 h by simple phase separation. The acidic ionic liquid [HSO_3pmim]Br was recycled for 5 times and the yield of 1,7-dibromoheptane did not decrease remarkably, which indicates that catalysts still maintain good selectivity and activity after recycling. The structure of the acidic ionic liquid [HSO_3pmim]Br was characterized with IR, and it was found that [HSO_3pmim]Br had stronger acidity than other ionic liquid.
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