(E)-9-(4-Chloro-styr-yl)-3,4,5,6,7,9-hexa-hydro-2H-xanthene-1,8-dione

Acta Crystallogr Sect E Struct Rep Online. 2012 Feb 1;68(Pt 2):o501. doi: 10.1107/S1600536812002139. Epub 2012 Jan 21.

Abstract

In the title compound, C(21)H(19)ClO(3), the two cyclo-hexenone rings adopt half-chair conformations, whereas the pyran ring adopts a boat conformation. The 4-chloro-phenyl ring is almost perpendicular to the plane through the four C atoms of the pyran ring [dihedral angle = 87.97 (6)°]. In the crystal, weak C-H⋯O hydrogen bonds link the mol-ecules into a chain parallel to the a-axis.