Phosphorus oxide (P4O10) → HCID 22618419, compound

Participants

Reaction Steps

5-Carbamoyl-4-cyano-1-(2,6-dichloro-4-trifluoromethylphenyl)-3-trifluoromethylpyrazole (3.57 g) was heated to 200° C. with phosphorus pentoxide (2.82 g) with stirring. After 3 hours, the cooled product was treated with ice, and extracted with dichloromethane (3×50 ml). The organic solution was washed with water, dried over anhydrous magnesium sulphate, and evaporated in vacuo to give a solid. Recrystallization from hexane gave 1-(2,6-dichloro-4-trifluoromethylphenyl)-4,5-dicyano-3-trifluoromethyl-pyrazole in the form of white crystals (1.8 g), m.p. 8 0° C.

Provenance & Evidence