Preparation of Silica Supported Ionic Liquids for Highly Selective Hydroxylation of Aromatics with Hydrogen Peroxide under Solvent-free Conditions
Keywords:Supported ionic liquid, silica gel, hydroxylation of aromatics, phenols, heterogeneous catalysis
AbstractA series of silica supported functionalized ionic liquid catalysts have been prepared and tested in the hydroxylation of aromatics to phenols with H2O2 under solvent-free conditions. The properties of the heterogeneous catalytic system were studied by tuning various reaction parameters including selection of catalyst, amount of the catalyst, influences of reaction time and temperature. Among the catalysts, CuCl3-IL-SiO2 exhibited the highest efficiency in the hydroxylation of aromatics to phenols under the optimized condition along with good recycle performance.
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