2,4-Dinitrochlorobenzene

2,4-Dinitrochlorobenzene (DNCB) is an organic compound with the formula (O₂N)₂C₆H₃Cl. It is a yellow solid that is soluble in organic solvents. It is an important intermediate for the industrial production of other compounds.

DNCB is produced commercially by the nitration of p-nitrochlorobenzene with a mixture of nitric and sulfuric acids. Other methods afford the compound less efficiently include the chlorination of dinitrobenzene, nitration of o-nitrochlorobenzene and the dinitration of chlorobenzene.