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A solution was made of 350 ml. of water, 35 gm. of NaOH, and 32 gm. of 1-methyl-3-nitro-4-pyrazolecarbonitrile. The solution was refluxed for 18 hours, cooled in an ice bath, and then acidified to pH 2 with concentrated HCl. A solid precipitated, which was filtered, washed with cold water, and recrystallized from methanol-water. The yield was 32.5 gm. of 1-methyl-3-nitro-4-pyrazolecarboxylic acid, m.p. 185°-187° C.

1. temperatureThe solution was refluxed for 18 hours
2. temperaturecooled in an ice bath
3. customA solid precipitated
4. filtrationwhich was filtered
5. washwashed with cold water
6. customrecrystallized from methanol-water