Acetic Acid → Phenyl(pyridazin-4-yl)methanone

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A solution of 4-benzylpyridazine (1.0 g, 5.9 mmol) in AcOH (28 mL) was added dropwise to a stirring suspension of SeO2 (3.2 g, 29.5 mmol) in AcOH (28 mL), the resulting mixture was heated to 100° C. for 1 h. TLC showed the starting material had disappeared, then the reaction solution was filtrated, the filtration was concentrated under reduced pressure, and Sat.aq Na2CO3 was added to adjust PH=9-10, then, extracted with DCM (50 mL×3), washed by brine, dried over Na2SO4 and concentrated to get the phenyl(pyridazin-4-yl)methanone (1.0 g, yield: 91%). 1H NMR (CDCl3 400 MHz): δ9.50-9.45 (m, 2H), 7.83 (d, J=7.6 Hz, 2H), 7.78-7.74 (dd, J=5.2, 2.4 Hz, 1H), 7.74-7.68 (m, 1H), 7.57 (t, J=7.2 Hz, 2H).

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