It was found that the treatment of saturated gamma-ketosulfide concentrates with an industrial aqueous solution of chlorine dioxide at 20degreesC results in their oxidation and oxidative chlorination. The oxidation of the saturated gamma-ketosulfide concentrates was nonselective, regardless of the mode of oxidant supply. The products were obtained as a mixture of y-ketosulfoxides, -sulfones, and -sulfochlorides, with their quantitative ratio depending on the reaction conditions and the composition of gamma-ketosulfide concentrates. The total conversion of gamma-ketosulfides ranged from 51.0 to 97.0% (rel.) at a chlorine dioxide consumption of 0.5-2.0 mol per mol of sulfur.