In continuing the study of nucleophilic substitution reactions in the pyrazole series, we conducted the reaction of 5-bromo-l, 3-dimethyl-4-nitropyrazole (I)[1] and 1, 5-dimethyl-3, 4- dinitropyrazole (II)[4] with hydrazine hydrate in boiling in isopropyl alcohol and 5-hydrazino-
