Hydrochloric Acid → 5-Chloro-4-chloromethyl-3-(4-chloro-phenyl)-1-phenyl-1H-pyrazole

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Reaction Steps

Hydrogen chloride gas is introduced into a mixture of 15 g of 5-chloro-3-p-chlorophenyl-4-hydroxymethyl-1-phenylpyrazole and 25 ml of concentrated hydrochloric acid and heating is carried out for 4 hours at boiling point. Following this 25 ml of toluene are mixed in. The layers are separated and the aqueous phase with toluene is removed. The organic layers are reduced in bulk by evaporation in vacuo, toluene is again added and reduction in bulk is repeated. 5-Chloro-4-chloromethyl-3-p-chlorophenyl-1-phenyl-pyrazole is obtained with a quantitative yield; F 96.5°-97° (from petroleum ether).

Provenance & Evidence