( E, E)-4,4′,6,6′-Tetrachloro-2,2′-(1,1′-azinodiethylene)diphenol.

The title compound, C18H16Cl4N2O2, was synthesized by the reaction of 1-(3,5-dichloro-2-hydroxyphenyl)propan-1-one with hydrazine hydrate. The molecule has a centre of symmetry at the mid-point of the N—N bond. The crystal structure is stabilized by intramolecular O—H...N and intermolecular C—H...Cl hydrogen bonds. [ABSTRACT FROM AUTHOR]