Brønsted acidic ionic liquids (ILs) have been synthesized and investigated as catalysts in esterification and reactions: simple and non-corrosive salts characterized by aliphatic cations associated an “acidic” anion (in particular, [HSO4]−) gave the higher yields. A quite good correlation between IL (H0) and catalytic ability was found although also the hydrophilic nature of the ionic medium affects the process efficiency.
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Chiappe et al. (2012) studied this question.
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