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2,4-Diamino-5-nitropyridine (5): A solution of <strong>[2604-39-9]4-amino-2-chloro-5-nitropyridine</strong> (4) (1.0 g, 5.76 mmol) in 50 ml 28percent NH4OH was heated in a sealed tube at 120° C. for overnight. After cooling the reaction mixture to room temperature afforded orange red solid 5 (0.770 g, 77percent). 1H NMR (DMSO-d6, 500 MHz): delta 8.66 (1H, s), 7.35 (1H, br s), 6.73 (1H, brs), 5.67 (1H, s); EIMS m/z: 155.2 (M+1), 153.2 (M-1)