3-Acetyl-4-hydroxy-6,7-dimethyl-2H-chromen-2-one

Abstract

In the title coumarin derivative, C13H12O4, the 2H-chromene ring system is essentially planar [maximum deviation = 0.047 (1) Å]. An intramolecular hydrogen bond is observed between the hydroxy and the ketonic O atoms. In the crystal, pairs of intermolecular C—H...O hydrogen bonds link inversion-related molecules into dimers. Additional intermolecular C—H...O hydrogen bonds further interconnect these dimers into two-dimensional arrays incorporating R22(9) ring motifs.