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Acta Cryst. (2013). E69, o1310  [ doi:10.1107/S1600536813019648 ]

Methyl 2-(2,2-dimethyl-3a,6a-dihydrofuro[3,2-d][1,3]dioxol-5-yl)-4-oxo-4H-chromene-3-carboxylate

Z. Fatima, T. Srinivasan, J. N. S. Rao, R. Raghunathan and D. Velmurugan

Abstract: In the title molecule, C18H16O7, the dioxolane ring adopts an envelope conformation with the dimethyl-substituted C atom as the flap. The furan ring is almost coplanar with the pyran ring, with a dihedral angle of 1.04 (10)° between the planes, and it makes a dihedral angle of 67.97 (11)° with the mean plane of the dioxolane ring. The latter makes a dihedral angle of 67.15 (10)° with the pyran ring. The O atom attached to the pyran ring deviates by -0.009 (1) Å. The crystal packing features C-H...O hydrogen bonds, forming a three-dimensional structure. The methoxycarbonyl atoms are disordered over two positions, with a refined occupancy ratio of 0.508 (18):0.492 (18).

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