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KMID : 1059520110550040685
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Journal of the Korean Chemical Society
2011 Volume.55 No. 4 p.685 ~ p.690
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Preparation of Novel Ionic Liquids and Their Applications in Brominating Reaction
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Hua Li
Juan Liu
Jiang Zhu
Hongkai Wang
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Abstract
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Novel acidic ionic liquids, 1-(ω-sulfonicacid)propyl-3-methylimidazolium bromide ([HSO3pmim]Br)and 1-(ω- sulfonicacid)butyl-3-methylimidazolium bromide ([HSO3bmim]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 oC for 2 h by simple phase separation. The acidic ionic liquid [HSO3pmim]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 [HSO3pmim]Br was characterized with IR, and it was found that [HSO3pmim]Br had stronger acidity than other ionic liquid.
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KEYWORD
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Ionic liquid (IL), 1, 7-dibromoheptane, Brominating agent, Catalyst
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