Esterification of carboxylic acids with alcohols could be carried out in a Brønsted acidic ionic liquid 1-methylimidazolium tetrafluoroborate ([Hmim]+BF4−). Good yields were obtained, and the esters produced could be easily separated from the reaction mixture without any volatile organic solvents. The ionic liquid [Hmim]+BF4− could be reused after removal of water.
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Zhu et al. (2003) studied this question.
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