1. A review of the chemistry of 1,2,4-oxadiazoles
2. Ueber Amidoxime und Azoxime
3. When a sample was heated in a sealed vessel in an oil bath at 250° for five minutes, it was shown by gas chromatography to be unchanged.
4. The solid was identified as N,N'-bis(p-chlorophenyl)urea. Its formation is explained by the addition of moisture, contained in the reaction system, to p-chlorophenyl isocyanate to form the corresponding carbamic acid that lost carbon dioxide and yielded p-chloroaniline. Addition of p-chloroaniline to the isocyanate gave the urea.
5. In a recent publication on the pyrolysis of 3, 5-diphenyl-1,2,4-oxadiazole, J. L. Cotter and G. J. Knight, Chem. Commun., 336 (1966), proposed a concerted cleavage-phenyl migration.