The organic functional groups, formyl, cyano, hydroxymethyl and methyl
sulfenyl, are oxidized with high yields in water only by using TBHP an
d controlling the pH of the reaction medium. In the presence of (CTA)(
2)SO4, the oxidation of the easily oxidizable sulfide group is prevent
ed and a highly chemoselective process is obtained. The role of the su
rfactant is discussed.