It is found that the dehydration of glucose to anhydroglucose, such as 1,6-anhydro-β-d-glucopyranose and 1,6-anhydro-β-d-glucofuranose, proceeds very effectively in hydrophobic ionic liquids, for example ionic liquid N,N-diethyl-N-(2-methoxyethyl)-N-methylammonium bis(trifluoromethanesulfonyl)amide, without any catalysts at high temperature. On the other hand, addition of a small amount of an ionic liquid with chloride anion reduces the yield of the anhydroglucose significantly.
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