Crystal structure of 6,6′-dimethyl-2H,2′H-3,4′-bichromene-2,2′-dione

Abstract

In the title compound, C20H14O4, the dihedral angle between the two coumarin ring systems is 52.37 (19)°, showing a gauche arrangement across the C—C bond which links the two units. The carbonyl groups of the two coumarin units adopt an s-trans arrangement. In the crystal, pairs of C—H...O hydrogen bonds and π–π interactions [centroid–centroid distance = 3.631 (2) Å] connect the molecules into inversion dimers.

Keywords

• crystal structure
• bicoumarin
• hydrogen bonds
• π–π interactions