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The common Lewis acid SnCl4 could efficiently convert glucose into 5-hydroxymethylfurfural in 1-ethyl-3-methylimidazolium tetrafluoroborate (EMimBF4). New evidence indicated that the formation of the five-membered-ring chelate complex of the Sn atom and glucose may play a key role for the formation of HMF, and the mechanism for the reaction was proposed. In addition, the EMimBF4/SnCl4 system was also suitable for the conversion of fructose, sucrose, inulin, cellobiose and starch.
Hu et al. (Thu,) studied this question.