(Z)-6-{[1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl-amino]methylene}-4-[(E)-(4-ethylphenyl)diazenyl]-cyclohexa-2,4-dienone

Abstract

The title compound, C19H23N3O4, adopts the keto-amine tautomeric form, with the H atom located on N rather than on O. This H atom is involved in a strong intramolecular hydrogen bond. The configuration around the azo N N double bond is trans and the dihedral angle between the two aromatic rings is 8.94 ( 2) degrees. The molecules, with intramolecular N - H........O hydrogen bonding, are linked by intermolecular O - H.......... O hydrogen bonds, forming a three-dimensional network.