Zhuang Li-Zhen, Zhang Ting-ting, Yu Yan-Wei
Nov 17, 2010
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Journal
Chinese Journal of Applied Chemistry
Abstract
Esterification reaction of boric acid,pinacol and cyclohexanol has been studied in ionic liquids(IL),including 1-methyl-2-pyrrolidonium hydrogen sulfate([Hnmp]HSO4),1-butyl-3-methylimidazolium tetrafluoroborate([Bmim]BF4) and 1-butyl-3-methylimidazolium hexafluorophosphate([Bmim]PF6).The influences of the types of ionic liquids,reaction temperature,reaction time and molar ratio of reactants to IL on the yields of 2-cyclohexyloxy-4,4,5,5-tetramethyl-[1,3,2]dioxaborolan have been investigated.The results showed that under the optimized conditions[n(boric acid):n(pinacol):n(cyclohexanol):n([Hnmp]HSO4) = 1:1:1:1,70 ℃ and 4 h],the yield of 2-cyclohexyloxy-4,4,5,5-tetramethyl-[1,3,2] dioxaborolan could reach up to 72.5%.The ionic liquid can be used repeatedly for four times without remarkable loss of the catalytic activity.