The molecule of the title compound, C26H20O4, is located on a twofold rotation axis. The two benzoyl groups are situated in an anti orientation. The dihedral angle between the mean planes of the phenyl ring and the naphthalene ring system is 80.25 (6)°. The phenyl and carbonyl groups in each benzoyl group are almost coplanar. The molecular packing is stabilized by weak C—H⋯O hydrogen bonds and a π–π stacking interaction between the phenyl rings [centroid–centroid and interplanar distances of 3.6383 (10) and 3.294 Å, respectively].
In the title compound, C19H15ClO3, the dihedral angle between the naphthalene ring system and the benzene ring is 72.06 (7)°. The 4-chlorophenyl group and the carbonyl group are almost coplanar. An intermolecular C—H⋯O hydrogen bond is formed between an H atom of the 4-chlorophenyl group and the O atom of one methoxy group, forming a zigzag chain along the a axis.
In the title compound, C19H15NO5, the dihedral angle between the naphthalene ring system and the benzene ring is 61.97 (5)°. The dihedral between the naphthalene ring system and the bridging carbonyl C—C(=O)—C plane is 54.68 (6)°, far larger than that [12.54 (7)°] between the phenyl group and the bridging carbonyl group. The nitro group and the phenyl ring are almost coplanar [O—N—C—C torsion angle = 2.94 (19)°]. In the crystal, molecules are linked by C—H⋯π interactions and the phenyl rings are involved in a centrosymmetric π–π interaction with a perpendicular distance of 3.523 Å and a lateral offset of 1.497 Å. In addition, weak intermolecular C—H⋯O hydrogen bonds are formed between an H atom of one methoxy group and a nearby carbonyl O atom.
In the title compound, C18H12BrClO3, the naphthalene ring system and the benzene ring make a dihedral angle of 82.18 (9)°. The conformation around the central C=O group is such that the C=O bond vector forms a larger angle to the plane of the naphthalene ring system than to the plane of the benzene ring, viz. 60.91 (16)° versus 13.94 (16)°. In the crystal structure, two π–π interactions formed between the naphthalene ring systems [centroid–centroid distances of 3.8014 (13) and 3.9823 (13) Å] and intermolecular O—H⋯O and C—H⋯O hydrogen bonds are present.
Key indicators: single-crystal X-ray study; T = 223 K; mean (C-C) = 0.003 Å; R factor = 0.028; wR factor = 0.075; data-to-parameter ratio = 13.1.The title compound, C 26 H 18 Cl 2 O 4 , 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 À3.8 (3) . The chlorophenyl and carbonyl groups are almost coplanar. Intermolecular hydrogen bonds exist between aromatic H and carbonyl O atoms. Experimental Crystal dataC 26 H 18 Cl 2 O 4 M r = 465.30 Orthorhombic, Pna2 1 a = 20.3750 (12) Å b = 13.3513 (8) Å c = 7.7876 (5) Å V = 2118.5 (2) Å 3 Z = 4 Cu K radiation = 3.03 mm À1 T = 223 K 0.40 Â 0.20 Â 0.10 mm Data collection Rigaku R-AXIS RAPID diffractometer Absorption correction: numerical (NUMABS; Higashi, 1999) T min = 0.469, T max = 0.739 32358 measured reflections 3800 independent reflections 3554 reflections with I > 2(I) R int = 0.039
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