Research Article: (E)-9-(4-Chloro­styr­yl)-3,4,5,6,7,9-hexa­hydro-2H-xanthene-1,8-dione

Date Published: February 01, 2012

Publisher: International Union of Crystallography

Author(s): Jae Kyun Lee, Ae Nim Pae, Yong Seo Cho, Joo Hwan Cha.


In the title compound, C21H19ClO3, the two cyclo­hexenone rings adopt half-chair conformations, whereas the pyran ring adopts a boat conformation. The 4-chloro­phenyl 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 mol­ecules into a chain parallel to the a-axis.

Partial Text

For the biological activity of xanthenes and their derivatives, see: Lee et al. (2011 ▶). For related structures of xanthenes, see: Asad et al. (2012 ▶); Fun et al. (2011 ▶); Mehdi et al. (2011 ▶).