Bromine → 3-Bromoacetyl-2,5-difluorobenzonitrile

Participants

Reaction Conditions

Reaction Steps

To a stirred mixture of 6.85 g of 3-acetyl-2,5-difluorobenzonitrile and 220 mL of CHCl3 heated at reflux is added dropwise over 75 minutes a solution of 2.1 mL of Br2 in 50 mL of CHCl3. The mixture is boiled for another 15 minutes, cooled to 25° C., washed sequentially with saturated NaHCO3 and H2O (200 mL each), dried with Na2SO4 and stripped in vacuo to 10.26 g of brown oil. The oil which contains 78% of 3-bromoacetyl-2,5-difluorobenzonitrile by NMR analysis is satisfactory for the next step.

Provenance & Evidence