1, 3-Dinitrodibenz [b, f][1, 4] oxazepin-11 (10 H)-one, prepared by intramolecular displacement of nitro group in N-(2-hydroxyphenyl)-2, 4, 6-trinitrobenzamide, reacts with O- and S-nucleophiles to yield the products of mono-or bis-substitution of the nitro groups. The
