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A series of perrhenate based ionic liquids were synthesized and used as efficient catalyst for the oxidation of sulfides to sulfones with aqueous hydrogen peroxide under mild conditions.Various sulfones were obtained in good to excellent yields.Initial studies were carried out using [Bmim]ReO4([Bmim]=1-methyl-3-butyl imidazolium)as catalysts for oxidation of sulfides in conventional [Bmim]BF4 ionic liquid in order to investigate the catalytic abilities of ILs(see Scheme 1).