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The molecule of the title compound, C14H14O2, lies on a crystallographic twofold axis perpendicular to the central C—C bond; there is one half-molecule in the asymmetric unit. The angle between the least-squares planes of the two aromatic rings is 66.94 (7)°. The methoxy group, with a twist angle of 10.69 (8)°, is slightly out of the plane of the benzene ring. In the crystal structure, C—H...π interactions are observed between adjacent molecules along the c-axis direction.

The title compound, C26H18Cl2O4, has two 4-chloro­benzoyl groups that are in an anti orientation and are approximately parallel. The inter­planar angle between the mean planes of the two benzene rings is 7.99 (8)°. These 4-chloro­benzoyl groups are twisted away from the attached naphthalene ring. The two inter­planar angles between the mean planes of the chloro­phenyl groups and the naphthalene ring system are 71.55 (7) and 71.98 (7)°. The torsion angles between the carbonyl groups and the naphthalene ring are 64.9 (2) and 64.4 (2)°, which are far larger than those between the 4-chloro­phenyl groups and the carbonyl groups of 0.0 (2) and −3.8 (3)°. The chloro­phenyl and carbonyl groups are almost coplanar. Inter­molecular hydrogen bonds exist between aromatic H and carbonyl O atoms.