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Acta Cryst. (2013). E69, o985
[ doi:10.1107/S1600536813014049 ]

(E)-9-(4-Fluorostyryl)-3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-2H-xanthene-1,8-dione

J. K. Lee, S.-J. Min, Y. S. Cho, J. H. Cha and S. O. Won

Abstract: In the title compound, C25H27FO3, each of the cyclohexenone rings adopts a half-chair conformation, whereas the six-membered pyran ring adopts a flattened boat conformation, with the O and methine C atoms deviating by 0.0769 (15) and 0.196 (2) Å, respectively, from the plane of the other four atoms (r.m.s. deviation = 0.004 Å). The C=C double bond adopts an E conformation. The dihedral angle between the benzene and pyran (all atoms) rings is 89.94 (10)°. In the crystal, weak C-H...O hydrogen bonds link the molecules into chains running parallel to the b axis.


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