摘要
Esterification of aromatic acid can be promoted via HSO3-functionalized Br nsted 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 ([MimC 4 SO 3 H][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.
Esterification of aromatic acid can be promoted via HSO3-functionalized BrOnsted acidic ionic liquids （1Ls）. 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.
基金
supported by the Natural Science Foundation of Shandong Province (ZR2010BL005)
Shandong Provincial Science and Technology Research Projects (2011GSF11818 and 2011YD02082)
