Sulfuric Acid → 4-Chloro-3-(4-chloro-3-formylphenyl)-5-difluoromethoxy-1-methyl-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

At 85° C., 4.65 g (10 mmol) of 3-(3-dibromomethyl-4-chloro-phenyl)-4-chloro-5-difluoromethoxy-1-methyl-1H-pyrazole were introduced a little at a time into 7 ml of concentrated sulfuric acid. The reaction solution was then stirred at 100° C. for 5 minutes, then stirred into 40 ml of ice-water. The solid product formed was filtered off and dried. Yield: 3.0 g;

Provenance & Evidence