Potassium Hydroxide → 4-bromo-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-1H-pyrazole-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of ethyl 4-bromo-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-1H-pyrazole-3-carboxylate (3.5 g, 7.37 mmol) in methanol (50 ml) at room temperature was added potassium hydroxide (830 mg, 14.8 mmol) in one portion. The reaction mixture was warmed to 100° C. and then stirred for 5 hours. The resulting solution was cooled down to room temperature and then evaporated the volatile solvent. The residue was acidified with 10% hydrochloric acid and then filtered using water and hexane. The filtrated solid was dried under vacuum to obtain the title compound (3.2 g, 97%) as pale yellow solid.

Provenance & Evidence