Acta Cryst. (2012). E68, o2216
[ doi:10.1107/S1600536812027699 ]

5,6-Dimethyl-1,2,9,10-tetrahydropyrano[3,2-f]chromene-3,8-dione

S. K. Goswami, L. R. Hanton, C. J. McAdam, S. C. Moratti and J. Simpson

Abstract: The title molecule, C₁₄H₁₄O₄, lies on a twofold rotation axis that bisects the central benzene ring, with only one half-molecule in the asymmetric unit. The pyranone systems adopt distorted twist- boat conformations, with the two methylene C atoms displaced by 0.537 (1) and 0.163 (2) Å from the best-fit plane through the remaining five C and O atoms (r.m.s. deviation = 0.073 Å). In the crystal, bifurcated C-H(O,O) hydrogen bonds link pairs of adjacent molecules in an obverse fashion, stacking molecules along c. These contacts are further stabilized by very weak - interactions between adjacent benzene rings with centroid-centroid distances of 4.1951 (4) Å. Additional C-HO contacts link these stacks, giving a three-dimensional network.

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