Acylation of nitrobenzhydrazides with nitrobenzoyl chlorides and ethyl chlorocarbonate yielded a number of corresponding 1,2-diacylhydrazines, which were converted by the action of phosphorus oxychloride to nitro-substituted 2,5-diphenyl- and 2-phenyl-5-ethoxy-1, 3,4-oxidazoles.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 741–743, June, 1977.