Dimethylformamide → HCID 178434096, compound

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5-methyl-4-[(3-nitrophenyl)hydrazono]-4H-pyrazol-3-ylamine was prepared from 3-nitroaniline (0.35 g, 2.5 mmol) and 3-amino-5-methylpyrazole (0.3 g, 3.1 mmol) according to the procedure described above except that the substituted aniline was initially dissolved in a mixture of water (3.6 mL) and DMF (2.0 mL) prior to being acidified. The product was isolated in a yield of 176 mg (29%) of the compound as a red solid and was not further purified. MS (m/z, ES+): 247.2 (M+1, 100%).

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