Butyl vinyl ether → 1-(4-Fluoro-2-methylphenyl)ethan-1-one

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To a solution of 2-bromo-5-fluorotoluene (5 g, 26.5 mmol) in DMF (65 ml) and water (15 ml) was added butyl vinyl ether (6.6 g, 65.9 mmol), palladium acetate (0.18 g, 0.8 mmol), 1,3-bis(diphenylphosphino)propane (0.72 g, 1.75 mmol) and potassium carbonate (4.4 g, 31.8 mmol). The reaction was heated at 80° C. for 48 h under nitrogen. The cooled reaction mixture was diluted with EtOAc (˜250 ml) and concentrated HCl added and shaken. Further EtOAc and water were added to obtain an easier separation of the 2 layers. The organic layer was washed with brine, dried (MgSO4), and concentrated. The residue was purified on a plug of silica eluting with 3% EtOAc/isohexane to give the title compound as an oil (1.95 g, 49%). 1H NMR (400 MHz, d6-DMSO) δ 2.45 (3H, s), 2.54 (3H, s), 7.13–7.17 (2H, m), 7.89–7.93 (1H, m).

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