The D-Glucose Phenylhydrazones

Two years later Behrend and Reinsberg, following the acetylation 

Attempts have been made to solve the problem by examining the rate of hydrolysis of the two D-glucose phenylhydrazones, and Frere-jacque/ who used oxalic acid and picric acid to remove the phenyl-hydrazine from the sphere of the reaction as an insoluble salt, claimed to show that both of the D-glucose a - and 9 -phenylhydrazones are derived from a-D-glucose on account of the downward trend of the mutarotation observed on making the solutions alkaline. This result is therefore not in conflict Avith the conclusions of Behrend. From similar studies StempeP concluded that no information of value concerning 

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