Ammonium Acetate → 2,6-Bis(2-pyridyl)-4(1H)-pyridone

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A mixture of 10 g (37 mmol) of 1,5-di-pyridin-2-yl-pentane-1,3,5-trione and 20 g (260 mmol) of ammonium acetate is boiled under reflux in 250 ml of ethanol for 8 hours. The mixture so obtained is concentrated to about half its volume. After filtration, 1′H-[2,2′;6′,2″]terpyridine-4′-one is obtained in the form of a white solid. 1H-NMR (360 MHz, DMSO-d6): 7.40-7.50 (qm, 2H); 7.87 (s, 2H); 7.92-8.0 (tm, 2H); 8.57 (d, 2H, 7.7 Hz); 8.68 (d, 2H, J=4.5 Hz), 10.9 (s, 1H). MS (EI pos., 70 eV), m/z=249 (100, [M+]); 221 (40).

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