Naphthaldehyde and Ce xtain of its Derivatives 853 The remainder of the purification was similar to that described above for the purification of the bromides from the thermal equilibrium experiments. The results of these experiments are included in Table I, which also contains a summary of previous experiments with standard procedures.

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Two crystalline chloral derivatives of glucose were reported by Heffter2 in 1889 but were not named. More detailed studies of the chloral derivatives of the various carbohydrates have been made by Hanriot3 and his associates, by Meunier,4 by Petit and Polonowski,3 and by Pictet and Reichel.6 The most recent formula for the j3-glucochloralose is that of Pictet and Reichel (Formula III). Most of the standard handbooks give the older formula of Hanriot (Formula I) or of Polonowski (Formula II). The evidence regarding the structure of ß-glucochloralose is conflicting. The absence of reducing properties, the failure to combine with hydroxylamine and phenylhydrazine and the resistance of the compound to hydrogenation all indicate that the free aldehyde groups of both the glucose and the chloral have been modified in their union. The formation of 1 This compound is also called "Parachloralose."