The oxidation of sulfides with 30% hydrogen peroxide catalyzed
by tantalum carbide provided the corresponding sulfoxides in high
yields. The reaction of sulfides with 30% hydrogen peroxide
catalyzed by niobium carbide efficiently afforded the corresponding
sulfones. These catalysts can easily be recovered from the reaction
mixture and may be repeatedly used as catalysts for the oxidation
without losing their activity.
tantalum carbide - niobium carbide - hydrogen
peroxide - sulfide - recyclable catalyst