Data obtained from oxidation of these esters with sodium periodate show that the maltose ester is glucopyranosido-4-glucopyranose-l-phosphate and that the xylose ester is D-xylopyranose-1 -phosphate. Both esters probably exist in the a-form.The rate constants for hydrolysis of these esters in 0.376 N hydrochloric acid at 36°and also their dissociation constants were determined.Maltose-1-phosphate and D-xylose-1-phosphate are not converted to polysaccharide by potato phosphorylase.

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The equilibrated solution gave no evidence of a stable enol and treatment with acid did not produce furfural.3. When trimethylxylose was treated with dilute alkali under the same conditions, it was transformed in part into the epimeric trimethyllyxose, a high iodine absorbing compound believed to be the monomethylenediol and saccharinic acid, the latter in small amount.4. Methyl alcohol was found in the alkaline solution of trimethylxylose approximately in the proportion of one mole to each mole of methylated sugar decomposed. On treatment with dilute acids, two further moles of methyl alcohol was liberated per mole of sugar decomposed and furfural was formed. A mechanism is proposed for this reaction.5. The gum formed consisted of trimethylxylose, trimethyllyxose and partially demethylated products in the proportion of 26 to 70 to 4 parts, respectively. Indirect evidence is advanced for the absence of ketose.6. The conversion of normal trimethylxylose into normal trimethyllyxose confirms the identity of their ring structures. Evanston, Illinois [Contribution from the Experimental Research Laboratories, Burroughs Wellcome and Company] MIXED BENZOINS. VI. FURTHER EXAMPLES OF REVERSIBILITY. THE FORMATION OF ADDITION COMPOUNDS

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