Acta Crystallographica Section E

Structure Reports Online

Volume 69, Part 4 (April 2013)

organic compounds

Acta Cryst. (2013). E69, o616-o617    [ doi:10.1107/S1600536813007952 ]


S. K. Mohamed, M. Akkurt, A. A. Abdelhamid, A. Saeed and U. Flörke

Abstract: In the xanthene ring system in the title compound, C19H18O4, the 4H-pyran ring has a maximum deviation of 0.110 (2) Å from planarity and the cyclo­hexene ring exhibits a puckered conformation [puckering parameters QT = 0.452 (3) Å, [theta] = 57.0 (4) and [varphi] = 131.7 (4)°]. The cyclo­hexene ring attached to the xanthene system adopts an envelope conformation, with the middle of the three methylene C atoms as the flap atom. In the crystal, O-H...O and C-H...O hydrogen bonds form infinite chains of R12(6) ring motifs along [100] with the xanthene groups arranged in an alternating zigzag manner.

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