Abstract
abstract A variety of Bronsted acidic ionic liquids were screened as catalysts for the esterification of salicylic acid.The experimental results indicated that SO 3 H-functionalized ionic liquids with HSO 4 performed high cat-alytic activity under microwave irradiation, and the yields can reach 91.9–93.6%. Furthermore, ionic liq-uids can be easily separated by simple decantation and have a fair reusability. The Bronsted acidity–catalytic activity relationships were also investigated and the results showed that the activity of theacidic ionic liquids is in excellent agreement with their acidity order.Crown Copyright 2010 Published by Elsevier B.V. All rights reserved. 1. IntroductionAs fine chemicals, methyl salicylate (MS) has been widely usedas flavor and fragrance agent, cosmetic and dye carrier, as well asultraviolet (UV)-light stabilizer in acrylic resins [1]. Fisher esterifi-cation is one of the simplest methods to obtain this ester. However,these reactions usually employ mineral acids, such as H
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