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Frhrejacque, Compt. rend. , J . Am. Chem. Soc.. 60, 1351 (1934) 26 E. G. V. NH3+and an intermediate substance which is symmetrically related to the isomeric forms of D-glucose. It is clear that there is no evidence for presuming the D-glucose “a)’-and phenylhydrazones t o be derived from a- and 0-D-glucose. “a,’- 2. The D-Fructose Methylphenylh ydrazones A further example of isomerism in the hydrazone series may be mentioned. Two D-fructose methylphenylhydrazones are known; one,” m. p. 118-119”, [(U]*~D5 0”; and another,’* m.

23) E. Goodyear and W. N. Haworth, J . Chem. , 3136 (1927). Drew and W. N. Haworth, J. Chem. , 2305 (1926). erroneously constructed, occur in an article by J. , 46, 2622 (1913). EMIL FISCHER'S STEREO-FORMULAS 19 by superficial consideration. This tetrahedron is one end of a series of several asymmetric carbon atoms and that apex of it which connects with asymmetric carbon atom 4, and an edge from this apex, remain in a straight line in the plane of the paper. -A XXVI tailed representation of Ia.

I. The D-Glucose Phenylhydrazones.. . . ........ 2. The D-Fructose Methylphenylhydrazones. . . . . . . . . . . . . 3. The Acyclic Hydrazones of D-Galactose.. . . . . . . . . . . . . 4. Optical Properties of Sugnr Hydrazones.. . . . . . . 111. Structural Studies on Sugar Osazones.. . . . . . . . . . . IV. Anhydi ides of Orazones and Hydrazoncs.. . . . . . 1. Anhydrides Prepared Directly from the Corrcsponding Osazones .

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