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Fe(NO3)3.9H2O and Cu(NO3)2.3H2O are efficient reagents for the conversion of thioethers to their sulfoxides in refluxing EtOAc in high yields. Fe(NO3)3.9H2O is also able to proceed the transformations under solvent free conditions at room temperature with excellent yields. Cu(NO3)2.3H2O is highly selective for the oxidation of aryl thioethers to the corresponding sulfoxides. Cu(NO3)2.3H2O also oxidizes catalytically thiols to their corresponding disulfides in excellent yields.
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