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Citation: ZHUANG Lizhen, ZHANG Tingting, WANG Yanwei, LIANG Hongze. Synthesis of Boric Acid Ester Catalyzed by Pyrrolidonium Acidic Ionic Liquid[J]. Chinese Journal of Applied Chemistry, ;2011, 28(1): 118-120. doi: 10.3724/SP.J.1095.2011.00216 shu

Synthesis of Boric Acid Ester Catalyzed by Pyrrolidonium Acidic Ionic Liquid

1.
Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo 315211

Corresponding author: LIANG Hongze,
Received Date: 13 April 2010
Available Online: 5 June 2010
Fund Project: 浙江省大学生科技创新活动计划(新苗人才计划) (新苗人才计划)宁波市科技局自然科学基金(2009A610047)资助项目 (2009A610047)

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.
- ionic liquid,
- esterification,
- boric acid ester,
- green chemistry
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