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Acta Cryst. (2013). E69, o1167  [ doi:10.1107/S1600536813017297 ]

(E)-2-Methoxy-9-(2-methoxy-9H-xanthen-9-ylidene)-9H-xanthene

X.-Y. Tian and Q.-H. Song

Abstract: The title compound, C28H20O4, was synthesized by a bimolecular Zn-HCl reduction in glacial acetic acid using the methoxy-substituted xanthone as a starting material. The crystal structure shows that the 2,2'-methoxybixanthenylidene unit is an E-type conformation anti-folded conformer. The molecule lies on an inversion center. The methoxy group is almost coplanar with the attached benzene ring, with a C-O-C-C torsion angle of 179.38 (14)°.


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