Application of dimethyl sulfoxide-trifluoroacetic anhydride for the oxidation of an isolated hydroxyl group of partially protected carbohydrates gave uloses in good yields, and for that of 2,3-dihydroxyl groups of d-glucosides followed by the reaction with carbonyl reagents gave easily 2,3-diulose derivatives.
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Yoshimura et al. (1977) studied this question.
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