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The general method of Pacsu and Green2 for the preparation of glycofuranosides from the sugar mercaptals was applied to mannosediethylmercaptal which was previously obtained3 from sirupy mannose by Fischer and from crystalline mannose by Levene and Meyer.4 It was found that this starting material could be prepared conveniently and in good yield directly from the readily available a-methyl-¿-mannopyranoside5 by the action of hydrochloric acid and ethyl mer-

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This article confirms the finding of Mehltretter and his collaborators2 that the oxidation of 2,4 ;3,-5-dimethylene-D-gluconic acid with alkaline po-