Crystal structure of 3-(2,2-dibromoacetyl)-4-hydroxy-2H-chromen-2-one

The title compound, C11H6Br2O4, is a new coumarin derivative obtained from the reaction of 3-acetyl-4-hydroxy-2H-chromen-2-one with bromine in acetic acid. The hydroxyl group in involved in an intramolecular O-H center dot center dot center dot O hydrogen bond. In the crystal, pi-pi interactions between the rings of the bicycle [intercentroid distances = 3.498 (2) and 3.539 (2) angstrom] pack molecules into stacks along the b axis, and weak intermolecular C-H center dot center dot center dot O hydrogen bonds further link these stacks into layers parallel to the ab plane.