1-Methylimidazolium Chlorosulfate ([HMIm]SO3Cl): A Novel Ionic Liquid with Dual Bronsted-Lewis Acidity

A novel acidic ionic liquid, 1-methylimidazolium chlorosulfate ([HMIm]SO3Cl]), with dual Bronsted-Lewis acidity was synthesized. This compound provided better catalytic performance in esterification and dehydration of fructose to 5-hydroxymethylfurfural (HMF) than acidic ionic liquids with only Bronsted or Lewis acidity.