Potassium Hydroxide → 3-Bromo-2-(4-nitrophenylazo)-5-hydroxypyridine

Participants

Reaction Steps

5-bromo-3-pyridinol (8.7 g, 0.05 mol) and potassium hydroxide (Fisher Scientific) were dissolved in water (200 ml). A suspension of p-nitrobenzenediazonium tetrafluoroborate (J. Org. Chem., Vol. 44, No. 9. 1979 p 1572-1573) (11.845 g, 0.5 mol) was added, and the mixture was stirred for 1 hour, diluted with acetic acid (50 ml) and filtered. The crude product was allowed to dry in air, then was chromatographed (silica gel; CHCl3 /MeOH, 95:5 to 90:10) provided 5.45 g (33.7%) of the title compound. MS (DCI/NH3) m/e 323-325 (M+H)+. 1H NMR (D6DMSO, 300 MHz) δ: 8.48-8.43 (m, 2H), 8.21-8.20 (d, J=2.37 Hz, 1H), 8.09-8.06 (m, 2H), 7.72-7.71 (d, J=2.37 Hz, 1H)

Provenance & Evidence