Water → 5-Cyanoacetylamino-1-(2,6-dichloro-4-trifluoromethyl-phenyl)-pyrazole

Participants

Reaction Steps

22.5 g (0.076 mol) of 5-amino-1-(2,6-dichloro-4-trifluoromethylphenyl)-pyrazole and 8 g (0.1 mol) of pyridine are taken in 200 ml of acetonitrile, and 13.2 g (0.128 mol) of cyanoacetyl chloride are added dropwise at 20°-25° C., while stirring and cooling. The reaction mixture is stirred at room temperature for a further two hours and then poured into water. After extraction with methylene chloride and drying of the organic phase over sodium sulphate, the solvent is distilled off in vacuo. The crystalline residue is stirred with a mixture of ligroin and diisopropyl ether and filtered off with suction. 22 g (80% of theory) of 5-cyanoacetylamino-1-(2,6-dichloro-4-trifluoromethyl-phenyl)-pyrazole of melting point 169°-175° C. are obtained.

Provenance & Evidence