1,4-Dinitrobenzene is one of three isomers of dinitrobenzene, with the formula C<sub>6</sub>H<sub>4</sub>(NO<sub>2</sub>)<sub>2</sub>. The 1,4-isomer is most symmetrical. The compound is a yellow solid that is soluble in organic solvents. It is prepared from 4-nitroaniline by diazotization followed by treatment with sodium nitrite in the presence of a copper catalyst.