1,4-Diazacycloheptane is an organic compound with the formula (CH<sub>2</sub>)<sub>5</sub>(NH)<sub>2</sub>. This cyclic diamine is a colorless oily liquid that is soluble in polar solvents. It is studied as a chelating ligand. The N-H centers can be replaced with many other groups.
It has known use in piperazine pharmaceuticals, for example: