We developed a simple, fast and new method for the Fries rearrangement of aryl esters. 4-Hydroxy pyridinium
triflate functionalized silica is a very efficient, reusable and economically available catalyst for the Fries rearrangement in
solvent-free condition and under microwave irradiation. Also, a notable selectivity was observed in the presence of 4-
hydroxy pyridinium triflate functionalized silica.
Keywords: Fries rearrangement, Aryl esters, SiO2 nanoparticles, Silica gel, CF3SO3H, 4-Hydroxy pyridinium triflate@SiO2
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