Crystal structure and Hirshfeld surface analysis of 2-hy-droxy-7-meth-oxy-1,8-bis-(2,4,6-tri-chloro-benzo-yl)naphthalene.

In the title compound, C25H12Cl6O4, the two carbonyl groups are oriented in a same direction with respect to the naphthalene ring system and are situated roughly parallel to each other, while the two 2,4,6-tri-chloro-benzene rings are orientated in opposite directions with respect to the naphthalene ring system: the carbonyl C-(C=O)-C planes subtend dihedral angles of 45.54 (15) and 30.02 (15)° to the naphthalene ring system are. The dihedral angles formed by the carbonyl groups and the benzene rings show larger differences, the C=O vectors being inclined to the benzene rings by 46.39 (16) and 79.78 (16)°. An intra-molecular O-H⋯O=C hydrogen bond forms an S(6) ring motif. In the crystal, no effective inter-molecular hydrogen bonds are found; instead, O⋯Cl and C⋯Cl close contacts are observed along the 21 helical-axis direction. The Hirshfeld surface analysis reveals several weak interactions, the major contributor being Cl⋯H/H⋯Cl contacts.

(3,5-Dimethyl-phen-yl)[8-(3,5-dimethyl-benzo-yl)-2,7-dimeth-oxy-naphthalen-1-yl]methanone.

In the title mol-ecule, C(30)H(28)O(4), the inter-planar angle between the two benzene rings of the 3,5-dimethyl-benzoyl groups is 50.35 (7)°. The dihedral angles between the two benzene rings and the naphthalene ring system are 81.87 (6) and 83.55 (6)°. In addition, the conformations of the pairs of methyl groups and their counterparts differ from each other though their environment is very similar. In the crystal, weak C-H⋯O inter-actions occur.

[8-(4-Chloro-benzo-yl)-2,7-dimeth-oxy-naphthalen-1-yl](2,4,6-trimethyl-phen-yl)methanone.

In the title compound, C(29)H(25)ClO(4), the dihedral angle between the benzene rings of the 2,4,6-trimethyl-benzoyl group and the 4-chloro-benzoyl group is 65.19 (9)°. The dihedral angles between the naphthalene ring system and the benzene rings of the 2,4,6-trimethyl-benzoyl group and the 4-chloro-benzoyl group are 85.66 (8) and 69.48 (8)°, respectively. In the crystal, two types of inter-molecular C-H⋯O inter-actions and an intra-molecular C-H⋯O inter-action are observed. Moreover, there is a short intra-molecular C=O⋯C=O contact of 2.614 (2) Šbetween the benzoyl substituents.

[2,7-Dimeth-oxy-8-(2,4,6-trimethyl-benzo-yl)naphthalen-1-yl](2,4,6-trimethyl-phen-yl)methanone.

In the title compound, C(32)H(32)O(4), the dihedral angle between the two benzene rings of the 2,4,6-trimethyl-benzoyl groups is 71.43 (7)°. The dihedral angles between the two benzene rings and the naphthalene ring system are 81.58 (5) and 84.92 (6)°. An intra-molecular C-H⋯O inter-action is observed.

[8-(4-But-oxy-benzo-yl)-2,7-dimeth-oxy-naphthalen-1-yl](4-but-oxy-phen-yl)methanone.

The mol-ecule of the title compound, C(34)H(36)O(6), is located on a twofold rotation axis. The two 4-but-oxy-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel. The dihedral angles between the benzene rings and the naphthalene ring system are 71.70 (4)°. In the crystal, the mol-ecules are connected via C-H⋯π inter-actions into a layer parallel to (010).

(2,7-Dimeth-oxy-naphthalen-1-yl)(2,4,6-trimethyl-phen-yl)methanone.

In the title compound, C(22)H(22)O(3), the dihedral angle between the naphthalene ring system and the benzene ring is 82.93 (5)°. The bridging carbonyl C-C(=O)-C plane makes dihedral angles of 50.11 (6) and 46.87 (7)°, respectively, with the naphthalene ring system and the benzene ring. In the crystal, three types of weak inter-molecular C-H⋯O inter-actions are observed.

7-Meth-oxy-1-(4-nitro-benzo-yl)naph-thalen-2-yl 4-nitro-benzoate.

In the title compound, C(25)H(16)N(2)O(8), the dihedral angle between the naphthalene ring system and the benzene ring of the nitro-phenyl ketone unit is 82.64 (7)°. The bridging ester O-C(=O)-C plane makes dihedral angles of 42.12 (8) and 11.47 (9)°, respectively, with the naphthalene ring system and the benzene ring of the nitro-phenyl ester unit. In the crystal, two types of weak inter-molecular C-H⋯O inter-actions are observed.

(2,7-Dimeth-oxy-naphthalen-1-yl)(4-fluoro-phen-yl)methanone.

In the title compound, C(19)H(15)FO(3), the dihedral angle between the naphthalene ring system and the benzene ring is 80.46 (4)°. In the crystal, mol-ecules are linked by inter-molecular C-H⋯O hydrogen bonds into chains parallel to the b axis.

(3,6-Dimeth-oxy-naphthalen-2-yl)(phen-yl)methanone.

In the title compound, C(19)H(16)O(3), the dihedral angle between the naphthalene ring system and the phenyl ring is 68.32 (5)°. The bridging carbonyl C-C(=O)-C plane makes a dihedral angle of 54.32 (5)° with the naphthalene ring system and 21.45 (6)° with the phenyl ring. An inter-molecular C-H⋯O hydrogen bond exists between the H atom of one meth-oxy group and the O atom of the second meth-oxy group in an adjacent mol-ecule. The crystal packing is additionally stabilized by a weak C-H⋯O inter-molecular inter-action between an H atom of the naphthalene ring and the O atom of the carbonyl group.

(3,6-Dimeth-oxy-naphthalen-2-yl)(2,4,6-trimethyl-phen-yl)methanone.

In the title compound, C(22)H(22)O(3), the dihedral angle between the naphthalene ring system and the benzene ring is 79.95 (5)°. The bridging carbonyl C-C(=O)-C group makes dihedral angles of 24.21 (7) and 82.43 (8)°, respectively, with the naphthalene ring system and the benzene ring. In the crystal, weak inter-molecular C-H⋯O inter-actions link mol-ecules into chains parallel to the c axis.

Bis(4-bromo-benzo-yl)(2,7-dimethoxy-naphthalene-1,8-di-yl)dimethanone.

In the title compound, C(26)H(18)Br(2)O(4), the two 4-bromo-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are anti to each other. The dihedral angle between the two benzene rings is 50.92 (14)°. The dihedral angles between the two benzene rings and the naphthalene ring system are 70.18 (11) and 74.98 (12)°. A weak inter-molecular C-H⋯O hydrogen bond exists between the methyl group and the carbonyl O atom.

(3,6-Dimeth-oxy-2-naphth-yl)(4-fluoro-benzo-yl)methanone.

In the title compound, C(19)H(15)FO(3), the dihedral angle between the naphthalene ring system and the benzene ring is 62.93 (5)°. The bridging carbonyl C-C(=O)-C plane makes dihedral angles of 45.55 (6) and 28.62 (7)°, respectively, with the naphthalene ring system and the benzene ring. Weak inter-molecular C-H⋯O hydrogen bonds and C-H⋯π inter-actions stabilize the crystal packing.

[2,7-Dimethoxy-8-(4-methylbenzoyl)-1-naphthyl](4-methylphenyl)methanone.

In the title compound, C(28)H(24)O(4), the two 4-methyl-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, the dihedral angle between the two phenyl rings being 9.64 (7)°. The dihedral angles between the two phenyl rings and the naphthalene ring system are 71.82 (6) and 71.58 (6)°. In the crystal, inter-molecular C-H⋯O inter-actions between the carbonyl oxygen and aromatic hydrogen are observed.