Ethyl 4-Chloro

Abstract

The title compound, C12H12N3O5, adopts a keto-hydrazo tautomeric form stabilized by an intramolecular hydrogen bond. The aromatic ring and aliphatic chain, which adopt a trans configuration about the N - N bond, are nearly coplanar, with a dihedral angle of 18.30 (6)degrees between them. The molecules pack via weak intermolecular C - H center dot center dot center dot O hydrogen bonds which, together with an intramolecular N - H center dot center dot center dot O bond, form an S(6) C(13) motif. The structure is further stabilized by C - H center dot center dot center dot pi and pi-pi interactions.