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HCX >cchz -c>c~°h 2c< >c=o >C-C-H xh2 H/ ¿h-ch3 CH, (III) (V) K3500 -0.117 K3390 -0.126absorption for hydroxyl, either associated or unassociated. The carbonyl absorption is that of a normal ketone. These data indicate that both the infrared and ultraviolet absorption spectra of the new compound are in accord with the keto structure (III).Structure of the Semicarbazone Formed from Compounds (I) and (III).-Compounds (I) and (III) each yields a semicarbazone which melts at 186-187°.1 Since these semicarbazones do not depress each other's melting points, they may be concluded to be identical. This conclusion is supported by their ultraviolet absorption curves (Fig. 3).The chemical data do not warrant the assignment of a definite structure to the semicarbazone in question, but a comparison of its ultraviolet absorption curve with that of cyclohexanone semicarbazone (Fig. 3) suggests that the semicarbazone in question is derived from isophorone (I) rather than from its isomer (III). If such is the fact, then when the semicarbazone is formed from (HI), the double bond is shifted, during the process of formation, from the ß, to the ,ß position. Summary 1.