4-[(4-Acetylphenyl)amino]-2-methylidene-4-oxobutanoic acid

Abstract

In the title compound, C13H13NO4, the N—C(=O) bond length of 1.354 (2) Å is indicative of amide-type resonance. The dihedral angle between the mean planes of the benzene ring and oxoamine group is 36.4 (3)°, while the mean plane of the 2-methylidene group is inclined by 84.2 (01)° from that of the oxoamine group. In the crystal, classical O—H...O hydrogen bonds formed by the carboxylic acid groups and weak N—H...O weak interactions formed by the amide groups and supported by weak C—H...O interactions between the 2-methylidene, phenyl and acetyl groups with the carboxylic acid, oxoamine and acetyl O atoms, together link the molecules into dimeric chains along [010]. The O—H...O hydrogen bonds form R22(8) graph-set motifs.