Some sulphoxides are oxidised to sulphones when treated with dioxygen in aqueous propan-2-ol in the presence of soluble iridium or rhodium catalysts. A catalyst derived from rhodium acetate and lithium chloride effects a reaction between dioxan and dioxygen to give a mixture of the di- and mono-formates of ethane-1,2-diol.
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HENBEST et al. (1974) studied this question.
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