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The above oxime (3.76 g, 17.24 mmol) and copper (II) acetate (370 mg) were dissolved in acetonitrile (100 cm3) under nitrogen and heated under reflux. After 5 h, the mixture was evaporated, the residue taken into EtOAc, washed with sulfuric acid (1N), water, brine, dried (MgSO4) and evaporated to give 3-fluoro-5-bromobenzonitrile (3.08 g, 15.39 mmol, 89%) which was used without further purification.

1. temperatureheated
2. temperatureunder reflux
3. customthe mixture was evaporated
4. washwashed with sulfuric acid (1N), water, brine
5. dry with materialdried (MgSO4)
6. customevaporated