Ethyl 4-Chloro-2-[(2-Nitrophenyl)hydrazono]-3-Oxobutyrate

Abstract

The title compound, C<inf>12</inf>H<inf>12</inf>N<inf>3</inf>O<inf>5</inf>, adopts a keto-hydrazo tautomeric form stabilized by intramolecular hydrogen bonds. The aromatic ring and aliphatic chain, which adopt a trans configuration about the C=N double bond, are nearly coplanar, with a dihedral angle of 7.56 (1)° between them. The molecules pack via weak intermolecular C-H⋯O hydrogen bonds which, together with intramolecular N-H-⋯O bonds, form an S(6)S(6)[R<inf>2</inf>2(13)]S(6)S(6) motif. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved.