3-Acetyl-5-hydroxy-2-methylanthra[1,2-b]furan-6,11-dione

Abstract

The asymmetric unit of the title compound, C19H12O5, contains two independent molecules, both slightly buckled along an axis passing through the C=O bonds of the anthraquinone ring system (r.m.s. deviation of non-H atoms = 0.082 and 0.148 Å): the benzene rings are twisted to each other by 4.3 (3)°in one molecule and 10.6(3)° in the other. In both molecules, the hydroxy group forms an intramolecular O—H...O hydrogen bond. The two independent molecules interact by π–π stacking with a centroid–centroid distance of 3.539 (2) Å between hydroxybenzene rings of adjacent molecules.