Abstract
β-Mo8O26 based alkyl imidazolium and pyridinium salts of general formula [Bmim]4Mo8O26 (Bmim=1-butyl-3-methylimidazolium), [Hmim]4Mo8O26 (Hmim=1-hexyl-3-methylimidazolium), [Dhmim]4Mo8O26 (Dhmim=1.2-dimethyl-3-hexylimidazolium) and [Hpy]4Mo8O26 (Hpy=1-hexylpyridinium) have been used as catalysts for the oxidation of sulfides using 30% hydrogen peroxide as oxidant. The examined β-Mo8O26 salts prove to be highly active and are self-separating. A high selectivity towards either sulfoxides or sulfones can be nicely controlled by variation of the reaction conditions. In both cases, the catalysts can be recycled and reused for several times without significant loss of activity, representing a good stability of the catalysts.
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