A novel environmentally benign oxidation method for practical and highly selective
production of various sulfoxides using n-Bu4NHSO5 catalyzed by simple tetradentate
Schiff base Mn(III)-complexes in ethanol under mild conditions has been developed. The
salen catalyst proved to be reusable for at least three times and the oxidant’s by-product (n-
Bu4NHSO4) could also be recycled. The efficiency of the catalytic system was influenced by
the nature of ligands so the best yields were achieved in the presence of Mn(Salphen)Cl as
Keywords: Catalysis, Mn-complexes, peroxomonosulfate, schiff base, sustainable sulfoxidation.
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