期刊
TETRAHEDRON LETTERS
卷 53, 期 25, 页码 3149-3155出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2012.04.045
关键词
5-Hydroxymethylfurfural; Fructose; Niobium pentachloride; 1-Butyl-3-methylimidozolium chloride
资金
- Ministry of Education, Science and Technology [2011-0022968]
Different metal chlorides in ionic liquids were examined as catalysts for fructose dehydration to 5-hydroxymethylfurfural (5-HMF). Niobium pentachloride (NbCl5) exhibited the highest 5-HMF yield. Reaction of 1.0 mmol fructose in 10.0 mmol 1-butyl-3-methylimidozolium chloride ([bmim]Cl) with 0.20 mmol NbCl5 afforded 79% of 5-HMF at 80 degrees C after 30 min. No degradation products were formed under these conditions. FTIR analysis indicates the moderate Lewis acidity of NbCl5, which was found suitable for the selective formation of 5-HMF. Other catalysts with higher Lewis acidities promoted 5-HMF side product formation which ultimately resulted in lower yields. (C) 2012 Elsevier Ltd. All rights reserved.
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