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A method of preparation of 5 amino 3,4 dinitropyrazole (1) from 3(5) methyl 5(3) nitro and 3(5) methyl 4,5(3) dinitropyrazoles was developed, the key step of which was the Hofmann rearrengement of nitro and dinitropyrazolecarboxamides. The protonation of 5 amino 3,4 dinitropyrazole was studied by spectral methods (UV spectroscopy, NMR spectroscopy). In spite of low basicity of the amino group, compound 1 undergoes N arylation, N nitration, and annulation reactions with formation of dinitropyrazolo[5,1 a]pyrimidine derivatives and hitherto unknown dinitroimidazo[1,2 b]pyrazole derivatives. Diazotization of 1 leads to 5 diazo 3,4 dinitropyrazole (19), which exists in the form of the internal salt. Some reactions of this compound were studied and the formation of the corresponding 5 halogeno(azido) 3,4 dinitropyrazoles under the action of the halide and azide ion was shown. Dinitropyrazolo [5,1 c][1,2,4]triazine and 7 hydroxydinitro 4,7 dihydropyrazolo[5,1 c] [1,2,4]triazine deriva tives were obtained by the action of active methylene compounds on the betaine 19.

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