M. Hirano et al., A MILD, INEXPENSIVE, AND CONVENIENT SYNTHESIS OF SULFOXIDES BY THE OXIDATION OF SULFIDES WITH CALCIUM HYPOCHLORITE AND MOIST ALUMINA, Synthesis, (10), 1997, pp. 1161
The dichloromethane-alumina biphasic system is a simple and effective
reagent for the selective oxidation of sulfides to the sulfoxides with
calcium hypochlorite.