Lee, J.K. Min, S.-J. Cho, Y.S. Cha, J.H. Won, S.O. 2024-01-20T12:05:10Z 2024-01-20T12:05:10Z 2021-09-02 2013-06 1600-5368 https://pubs.kist.re.kr/handle/201004/128030 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. English (E)-9-(4-Fluorostyryl)-3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-2H- xanthene-1,8-dione Article 10.1107/S1600536813014049 1 Acta Crystallographica Section E: Structure Reports Online, v.69, no.6 Acta Crystallographica Section E: Structure Reports Online 69 6 scopus 2-s2.0-84878738322 Article xanthene Hydrogen-bond geometry half-chair conformation