[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][C:11]([C:14](=O)[CH2:15][CH2:16][C:17]([OH:19])=[O:18])=[CH:10][CH:9]=2)=[CH:4][CH:3]=1.C(=O)([O-])[O-].[K+].[K+].Cl.[NH2:28][OH:29]>C(O)C.O.CO>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][C:11]([C:14](=[N:28][OH:29])[CH2:15][CH2:16][C:17]([OH:19])=[O:18])=[CH:10][CH:9]=2)=[CH:4][CH:3]=1To a stirred suspension of 4-(4′-bromo-biphenyl-4-yl)-4-oxo-butyric acid (0.718 g, 0.00215 mol) and potassium carbonate (0.167 g, 0.00121 mol) in absolute ethanol (15 mL) was added a solution of hydroxylamine hydrochloride (0.180 g, 0.00259 mol) in water (3 mL), and the mixture stirred at room temperature for 6 days. The mixture was rotary evaporated. The residue was dissolved in methanol, silica gel (10 g) was added, and the mixture rotary evaporated to dryness. The powder was purified by chromatography on silica gel, eluting with dichloromethane-methanol (20:1) to give 0.499 g of 4-(4′-bromo-biphenyl-4-yl)-4-hydroxyimino-butyric acid as a white solid; mp 175-176° C.
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