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

摘要

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)°.