Water → 1,3-Dimethyl-4-(2,4-dichlorobenzoyl)-5-trichloroacryloyloxy pyrazole

Participants

Reaction Steps

2.85 g of 1,3-dimethyl-4-(2,4-dichlorobenzoyl)-5-hydroxy pyrazole and 1.01 g of triethylamine were dissolved in 20 ml of benzene. 1.94 g of trichloroacrylic acid chloride were dropped into the solution. The reaction mixture was stirred for 3 hours at the reflux temperature of benzene. After the completion of the reaction, water was added to the reaction mixture, the organic layer was separated and dried. Benzene was distilled off under reduced pressure to give 3.3 g of 1,3-dimethyl-4-(2,4-dichlorobenzoyl)-5-trichloroacryloyloxy pyrazole as colorless crystals of melting point 141° to 142° C.

Provenance & Evidence