Hydrazine → 6-(4-Bromophenyl)-4,5-dihydropyridazin-3(2H)-one

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A solution of 4-(4-bromo-phenyl)-4-oxo-butyric acid (Aldrich, 25.0 g, 97.3 mmol) in EtOH (100 mL) was treated with aqueous hydrazine (Aldrich, 55%, 9.1 mL, 100 mmol) at 80° C. for 2 h. The mixture was cooled to room temperature and the precipitate was collected by filtration and dried under vacuum to provide the title compound (24 g, 97% yield). 1H NMR (300 MHz, CDCl3) δ 2.35-2.76 (m, 2 H), 2.80-3.11 (m, 2 H), 7.45-7.77 (m, 4 H), 8.55 (s, 1 H); MS (DCl/NH3) m/z 253 (M+H)+, 255 (M+H)+.

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