Denitration of 5-R-substituted 3-nitro-1-trinitromethyl-1 H-1,2,4-triazoles (R = CH3, Cl, Br, N3, NH2) by the action of potassium iodide or hydroxylamine, followed by treatment with sulfuric acid, gave the corresponding 1-dinitromethyl derivatives which were shown to be very strong CH acids (p K a −0.55 to −1.62).