Bromine → 4-Bromo-1-(4-fluorophenyl)-5-[4-(methylthio)phenyl]pyrazole

Participants

Reaction Conditions

Reaction Steps

A solution of bromine (0.9 g) in dichloromethane (2 ml) was added dropwise to an ice-cooled solution of 1-(4-fluorophenyl)-5-[4-(methylthio)phenyl]pyrazole (1.6 g) in dichloromethane (10 ml). The mixture was stirred at 5° C. for 1 hour, washed with a solution of sodium bisulfite and water, dried, and concentrated in vacuo. The residue (1.9 g) was recrystallized from ethanol to give crystals of 4-bromo-1-(4-fluorophenyl)-5-[4-(methylthio)phenyl]pyrazole (1.3 g).

Provenance & Evidence