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1,2,4‐Oxadiazole (V) has been prepared by formylation of formamidoxime with acetico‐formic anhydride and cyclization of the O‐formyl derivative VI. Some N‐formyl‐formamidoxime (VII) is formed during this reaction. Isolated by the salting out of its aqueous solution the crude oxadiazole is purified by means of its addition product with CdCl2, which yields pure oxadiazole by steam distillation and subsequent salting out.

The thermal decomposition of phenyl carbazate results in formation of 4-amino urazole. The same compound is formed in reactions which according to other authors yield p-urazine. This six-membered cyclic isomer could not be prepared. The structure of 4-amino urazole is confirmed by study of infrared spectra and its reaction with acetone and benzaldehyde.The reaction of urea with the carbohydrazide has also been studied.Au cours d'une publication antkrieure (I), nous avons signal6 que le carbazinate de phbnyle, chauff6 A une temperature ti peine supdrieure i i 800, se d6composait facilement en phCnol et en une substance de formule C2H4N402. 2

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