Key indicators: single-crystal X-ray study; T = 193 K; mean (C-C) = 0.002 Å; R factor = 0.036; wR factor = 0.099; data-to-parameter ratio = 13.6.In the title molecule {systematic name: [2,7-dimethoxy-8-(4-phenoxybenzoyl)naphthalen-1-yl](4-phenoxyphenyl)methanone}, C 38 H 28 O 6 , the 4-phenoxybenzoyl units adopt a syn orientation with respect to the naphthalene ring system. The internal benzene rings, A and B, make dihedral angles of 86.72 (5) and 79.22 (5) with the naphthalene ring system. The two terminal benzene rings, C and D, of the 4-phenoxybenzoyl groups are twisted with respect to benzene rings A and B, with dihedral angles of A/C = 62.72 (8) and B/D = 87.61 (6) . In the crystal, H atoms in the naphthalene system make two types of intermolecular C-HÁ Á ÁO interactions with the carbonyl O atom and the phenyl etheral O atom of neighbouring molecules. Molecules are further linked by C-HÁ Á Á interactions involving a H atom of terminal benzene ring D and the -system of the internal benzene ring A, forming dimers centered about an inversion center. Related literature

In the title compound, C40H32Cl2O4, the two chloro­benzene rings are in syn orientations with respect to the naphthalene ring system and make dihedral angles of 57.12 (6) and 85.74 (6)° with it. The benzene rings of the benz­yloxy group make dihedral angles of 75.34 (6) and 83.95 (7)°, with the naphthalene ring system. In the crystal, the mol­ecules are linked by inter­molecular C—H⋯Cl inter­actions between the methyl­ene H atoms of the benz­yloxy group and the Cl atoms in adjacent mol­ecules. Furthermore, centrosymmetrically related mol­ecules are linked into dimeric units by pairs of C—H⋯π inter­actions.

In the title compound, C19H14ClNO5, the aroyl group is attached to the naphthalene ring system with a non-coplanar configuration. The dihedral angle between naphthalene ring system and benzene ring is 70.62 (6)°. The nitro group is oriented in parallel with the adjacent carbonyl plane. The torsion angle of the carbonyl group and naphthalene ring is 54.68 (19)° (C—C—C—O), and that of nitro group and naphthalene ring is 54.26 (18)° (O—N—C—C). In the crystal, π–π inter­actions between naphthalene systems [centroid–centroid distances = 3.5633 (9), 3,5634 (9), and 3.9758(9) Å], C—H⋯O hydrogen bonds, inter­molecular N—O⋯Cl inter­actions [2.9937 (12) Å] and C—H⋯π contacts are observed.