Abstract
Esterification of aromatic acid can be promoted via HSO3-functionalized Brønsted acidic ionic liquids (ILs). Under the optimum conditions, using 1-(3-sulfonic acid) propyl-3-methylimidazolium hydrogen sulfate ([MimC3SO3H][HSO4]) and 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate ([MimC4SO3H][HSO4]) as dual solvent-catalysts, the conversion of esterification of aromatic acid was determined to be more than 90%, indicating that HSO3-functionalized ILs show much better catalytic ability than those of non-functionalized ionic liquids. The separation of desired product was easily performed by extraction with diethyl ether and these HSO3-functionalized ILs could be reused 7 times after vacuum drying. Our data represent an environmentally friendly method for the preparation of aromatic esters.
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Zhou, F., Xin, B. & Hao, J. HSO3-functionalized Brønsted acidic ionic liquids promote esterification of aromatic acid. Chin. Sci. Bull. 58, 3202–3207 (2013). https://doi.org/10.1007/s11434-013-5888-x
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DOI: https://doi.org/10.1007/s11434-013-5888-x