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

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) ？, respectively, from the plane of the other four atoms (r.m.s. deviation = 0.004 ？). 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. ？ Lee et al. 2013.