4-(9-Anthr-yl)-1-(2-Methoxy-Phen-yl)spiro-[Azetidin-3,9'-Xanthen]-2-one

Abstract

The stabilized conformation of the title compound, C36H 25NO3O, 4-(9-anthryl)-1-(2-methoxyphenyl)-spiro[azetid-in- 3,9′-xanthen]-2-one, may be compared with that of the isomeric compound 4-(9-anthr-yl)-1-(4-methoxy-phen-yl)spiro-[azetidin-3,9′-xanthen]-2-one. In the title isomer, the meth-oxy group is slightly twisted out of the plane of the attached benzene ring, with a C - O - C - C torsion angle of 31.5 (2)°. Its Β-lactam ring is essentially planar, with a maximum deviation of -0.021 (1) Å. The Β-lactam ring makes dihedral angles of 18.815 (9), 83.33 (7) and 53.62 (8)° with the mean planes of the benzene, xanthene and anthracene ring systems, respectively. The structure is stabilized by C - H⋯π, C - H⋯N and C - H⋯O inter-actions.