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Résumé :
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A basic resin in OH− form (Amberlite IRA-900) has been used to catalyze the regiospecific epoxidation of carvone with H2O2 to obtain 5,6-epoxycarvone, showing high activity and selectivity (>99%). The effects of solvent, temperature, stirring rate, catalyst loading, oxidant/substrate ratio, and oxidant dosage have been analyzed. A second-order kinetic model has been proposed to describe the effect of substrate concentration, catalyst loading, and temperature on reaction rate, and the apparent activation energy of the reaction has been estimated. The catalyst has been tested in five consecutive runs and it has shown to be completely reusable after regeneration of its hydroxyl groups before each use.
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