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Catalysts 2017, 7(9), 245; doi:10.3390/catal7090245

Conversion of Carbohydrates into Platform Chemicals Catalyzed by Alkaline Ionic Liquids

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Received: 19 June 2017 / Revised: 7 August 2017 / Accepted: 18 August 2017 / Published: 23 August 2017
(This article belongs to the Special Issue Organocatalysis in Ionic Liquids)
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Abstract

A series of alkaline ionic liquids (ILs) including 1-butyl-3-methylimidazolium benzoate ([BMIM]PHCOO), 1-butyl-3-methylimidazolium carbonate ([BMIM]2CO3), 1-butyl-3-methylimidazolium acetate ([BMIM]OAc), 1-butyl-3-methylimidazolium hydroxide ([BMIM]OH), ethanolamine tetrafluoroborate ([MEA]BF4), and 1,1,3,3-tetramethylguanidine (TMG)-based ILs, etc., were synthesized and utilized as catalysts for the conversion of carbohydrates into 5-HMF. 1,1,3,3-tetramethylguanidine tetrafluoroborate ([TMG]BF4) was confirmed to exhibit excellent catalytic activity, and was much cheaper than other ILs such as 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) for use as a solvent in the conversion of C6 carbohydrates into 5-HMF. The 5-HMF yields from fructose, glucose, cellobiose, and microcrystalline cellulose (MCC) were 74.19%, 27.33%, 20.20%, and 17.73%, respectively. In addition, the possible pathway of carbohydrates (MCC, cellobiose, glucose, etc.) conversion into 5-HMF with [TMG]BF4 as a catalyst was speculated, and the conversion of glucose into 5-HMF was determined to likely be the committed step in the transformation of MCC catalyzed by [TMG]BF4. View Full-Text
Keywords: alkaline ionic liquids; conversion of carbohydrates; 5-HMF; [TMG]BF4 alkaline ionic liquids; conversion of carbohydrates; 5-HMF; [TMG]BF4
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Du, X.; Zhang, J.; Wang, Y.; Qu, Y. Conversion of Carbohydrates into Platform Chemicals Catalyzed by Alkaline Ionic Liquids. Catalysts 2017, 7, 245.

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