(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, C<inf>19</inf>H<inf>23</inf>N<inf>3</inf>O<inf>4</inf>, 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)°. The molecules, with intramolecular N-H⋯O hydrogen bonding, are linked by intermolecular O-H⋯O hydrogen bonds, forming a three-dimensional network. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved.