Sulfuric Acid → HCID 10223062, compound

Participants

Reaction Steps

To stirred 80% sulphuric acid (22 ml) was added 5-amino-4-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-3-trifluoromethylpyrazole (3.98 g) at 80° C. After 1 hour, the cooled solution was poured onto ice and extracted with dichloromethane (3×). The combined extracts were washed with water, dried over anhydrous magnesium sulphate, filtered, and evaporated in vacuo to give a white solid. This solid was recrystallized from ethyl acetate-petroleum ether to give 5-amino-4-carbamoyl-1-(2,6-dichloro-4-trifluoromethylphenyl)-3-trifluoromethylpyrazole (3.5 g), m.p. 169°-171° C. in the form of white crystals.

Provenance & Evidence