Toyokazu Muto

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

In the title compound, C28H24O4, the two 4-methylbenzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost antiparallel, 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, intermolecular C—H⋯O interactions between the carbonyl oxygen and aromatic hydrogen are observed.

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

The molecule of the title compound, C34H36O6, is located on a twofold rotation axis. The two 4-butoxybenzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost antiparallel. The dihedral angles between the benzene rings and the naphthalene ring system are 71.70 (4)°. In the crystal, the molecules are connected via C—H⋯π interactions into a layer parallel to (010).

Bis(4-bromo­benzo­yl)(2,7-dimethoxy­naphthalene-1,8-di­yl)dimethanone

In the title compound, C26H18Br2O4, the two 4-bromobenzoyl 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 intermolecular 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, C19H15FO3, 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 intermolecular C—H⋯O hydrogen bonds and C—H⋯π interactions stabilize the crystal packing.

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

In the title molecule, C30H28O4, the interplanar angle between the two benzene rings of the 3,5-dimethylbenzoyl 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 interactions occur.

[2,7-Dimeth­oxy-8-(2,4,6-trimethyl­benzo­yl)naphthalen-1-yl](2,4,6-trimethyl­phen­yl)methanone

In the title compound, C32H32O4, the dihedral angle between the two benzene rings of the 2,4,6-trimethylbenzoyl 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 intramolecular C—H⋯O interaction is observed.

(2,7-Dimeth­oxy­naphthalen-1-yl)(2,4,6-trimethyl­phen­yl)methanone

In the title compound, C22H22O3, 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 intermolecular C—H⋯O interactions are observed.

(3,6-Dimeth­oxy­naphthalen-2-yl)(phen­yl)methanone

In the title compound, C19H16O3, 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 intermolecular C—H⋯O hydrogen bond exists between the H atom of one methoxy group and the O atom of the second methoxy group in an adjacent molecule. The crystal packing is additionally stabilized by a weak C—H⋯O intermolecular interaction between an H atom of the naphthalene ring and the O atom of the carbonyl group.

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

In the title compound, C19H15FO3, the dihedral angle between the naphthalene ring system and the benzene ring is 80.46 (4)°. In the crystal, molecules are linked by intermolecular C—H⋯O hydrogen bonds into chains parallel to the b axis.

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

In the title compound, C29H25ClO4, the dihedral angle between the benzene rings of the 2,4,6-trimethylbenzoyl group and the 4-chlorobenzoyl group is 65.19 (9)°. The dihedral angles between the naphthalene ring system and the benzene rings of the 2,4,6-trimethylbenzoyl group and the 4-chlorobenzoyl group are 85.66 (8) and 69.48 (8)°, respectively. In the crystal, two types of intermolecular C—H⋯O interactions and an intramolecular C—H⋯O interaction are observed. Moreover, there is a short intramolecular C=O⋯C=O contact of 2.614 (2) Å between the benzoyl substituents.