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BENZYLTRIPHENYLPHOSPHONIUM PEROXODISULFATE (PhCH2PPh3)2S2O8: A MILD AND INEXPENSIVE REAGENT FOR HIGHLY ENANTIOMERIC PURITY OF α-SULFINYL OXIMES AND α-SULFINYL HYDRAZONES TO THE CORRESPONDING β-KETO SULFOXIDES

ABSTRACT 

Benzyltriphenylphosphoniumperoxodisulfate (PhCH2PPh3)2S2O, (I) is readily prepared as an white solid from benzyltriphenylphosphoniumchloride, performs conversion of α-sulfinyl oximes (2) and α-sulfinyl hydrazones (4) to the corresponding β-keto sulfoxides (3) in high yields and high enantiomeric purity.