Water → HCID 58542585, compound

Participants

Reaction Steps

A solution of 700 mg (3.39 mmol) of methyl 3-(difluoromethoxy)-1-methyl-1H-pyrazole-5-carboxylate in 20 ml of chloroform is admixed dropwise with a solution of 570 mg (3.56 mmol) of bromine in 10 ml of chloroform and then stirred for three days at room temperature. The reaction mixture is added to 80 ml of water with some sodium bisulfite and shaken. The organic phase is separated off, dried over magnesium sulphate, filtered and concentrated by evaporation in vacuo: 792 mg of methyl 4-bromo-3-(difluoromethoxy)-1-methyl-1H-pyrazole-5-carboxylate (82%) are produced as white crystals.

Provenance & Evidence