(4-Eth-oxy-benzo-yl)[8-(4-eth-oxy-benzo-yl)-2,7-di-meth-oxy-naphthalen-1-yl]methanone.

The title mol-ecule, C30H28O6, possesses crystallographically imposed twofold symmetry, with two central C atoms in the naphthalene unit lying on the rotation axis along [001]. The 4-eth-oxy-benzoyl groups at the peri positions of the naphthalene ring system are disordered over two sets of sites with occupancies of 0.769 (4) and 0.

[2,7-Dieth-oxy-8-(4-fluoro-benzo-yl)naphthalen-1-yl](4-fluoro-phen-yl)methanone.

In the mol-ecule of the title compound, C28H22F2O4, the benzoyl groups are aligned almost anti-parallel and the fluorobenzene rings form a dihedral angle of 14.12 (7)°. The dihedral angles between the 2,7-dieth-oxy-naphthalene ring system and the benzene rings are 70.

Bis(1-benzoyl-7-meth-oxy-naphthalen-2-yl) terephthalate.

The title molecule, C44H30O8, lies about a crystallographic inversion centre located at the centre of the central benzene ring. The benzene rings in the benzoyl and the terephthalate units make dihedral angles of 67.05 (7)° and 57.

1,8-Bis(4-fluoro-benzo-yl)naphthalen-2,7-diyl dimethane-sulfonate.

The mol-ecule of the title compound, C26H18F2O8S2, lies across a crystallographic twofold rotation axis. The benzene rings of the 4-fluorobenzoyl groups make dihedral angles of 78.93 (12)° with the naphthalene ring system.

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

In the title mol-ecule, C25H20O4, the naphthalene and phen-oxy groups are oriented nearly perpendicular with respect to the benzene ring of the benzoyl group, with dihedral angles of 89.61 (5) and 86.13 (6)°, respectively.

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

In the mol-ecule of the title compound, C20H18O4, the dihedral angle between the naphthalene ring system and the benzene ring is 81.74 (5)°. An inter-molecular C-H⋯O inter-action is formed between an H atom at the 6-position of the naphthalene ring and the O atom of the meth-oxy group at the 7-position.

{2,7-Dimeth-oxy-8-[4-(2-methyl-prop-yl)benzo-yl]naphthalen-1-yl}[4-(2-methyl-prop-yl)phen-yl]methanone.

In the mol-ecule of the title compound, C34H36O4, the two 4-isobutyl-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, and the benzene rings make a dihedral angle of 21.59 (7)°. The dihedral angles between the benzene rings and the naphthalene ring system are 69.

[2,7-Dibut-oxy-8-(4-fluoro-benzo-yl)naphthalen-1-yl](4-fluoro-phen-yl)methanone.

In the title compound, C32H30F2O4, the benzene rings of the benzoyl groups make dihedral angles of 74.55 (6) and 74.39 (7)° with the naphthalene ring system.

[8-(4-Phen-oxy-benzo-yl)-2,7-bis-(propan-2-yl-oxy)naphthalen-1-yl](4-phen-oxy-phen-yl)methanone.

The entire title mol-ecule, C(42)H(36)O(6), is completed by the application of a twofold axis. The 4-phen-oxy-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel. The dihedral angle between the best planes of the benzene rings of the benzoyl moieties and the naphthalene ring system is 70.

1-Benzoyl-naphthalene-2,7-diyl dibenzoate.

In the title compound, C(31)H(20)O(5), the phenyl rings of the benzo-yloxy and benzoyl groups are twisted away from the naphthalene ring system by 64.27 (6), 73.62 (5) and 80.

[2,7-Dihy-droxy-8-(4-phen-oxy-benzo-yl)naphthalen-1-yl](4-phen-oxy-phen-yl)methanone.

In the title compound, C(36)H(24)O(6), the benzoyl groups at the 1- and 8-positions of the naphthalene system are in an anti orientation. Both carbonyl groups form intra-molecular O-H⋯O hydrogen bonds with hy-droxy groups affording six-membered rings. The benzene rings of the benzoyl groups make dihedral angles of 59.

(4-Fluoro-phen-yl)[8-(4-fluoro-benzo-yl)-2,7-diphen-oxy-naphthalen-1-yl]methan-one.

In the title compound, C(36)H(22)F(2)O(4), the aromatic rings of the benzoyl and phen-oxy groups make dihedral angles of 72.07 (5), 73.24 (5), 62.

4-Hy-droxy-methyl-10-meth-oxy-17,22-dioxapenta-cyclo-[21.2.2.2(13,16).1(3,7).0(11,30)]triaconta-1(25),3,5,7(30),8,10,13,15,23,26,28-undeca-ene-2,12-dione acetone monosolvate.

In the title compound, C(30)H(26)O(6)·C(3)H(6)O, the syn-oriented benzoyl groups are nearly parallel to each other; the dihedral angle between their benzene rings is 15.9 (1)°. They form dihedral angles of 72.

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

In the title compound, C(32)H(32)O(4), the 4-propyl-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, and their benzene rings make a dihedral angle of 8.64 (10)°. The dihedral angles between the naphthalene ring system and the benzene rings are 69.

4-{[8-(4-Acetyl-oxybenzo-yl)-2,7-dimeth-oxy-naphthalen-1-yl]carbon-yl}phenyl acetate.

In the mol-ecule of the title compound, C(30)H(24)O(8), the two 4-acet-oxy-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, and the two benzene rings make a dihedral angle of 54.21 (9)°. The dihedral angles between the benzene rings and the naphthalene ring system are 63.

1,8-Dibenzoyl-naph-tha-lene-2,7-diyl dibenzoate.

In the title compound, C(38)H(24)O(6), the phenyl rings of the benzoyl and benzo-yloxy groups make dihedral angles of 67.12 (5), 85.15 (5), 76.

{8-[4-(Bromo-meth-yl)benzo-yl]-2,7-dimeth-oxy-naphthalen-1-yl}[4-(bromo-meth-yl)phen-yl]methanone.

In the title compound, C(28)H(22)Br(2)O(4), the two 4-bromo-methyl-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, the benzene rings forming a dihedral angle of 2.94 (16)°. The dihedral angles between the benzene rings and the naphthalene ring systems are 70.

[2,7-Dimeth-oxy-8-(2-naphtho-yl)naphthalen-1-yl](naphthalen-2-yl)methanone.

The mol-ecule of the title compound, C(34)H(24)O(4), possesses crystallographically imposed twofold C(2) symmetry. The two 2-naphthoyl groups at the 1- and 8-positions of the central naphthalene ring are aligned almost anti-parallel [5.21 (5)°].

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.

1,2-Bis(benz-yloxy)-1,2-bis-(4-chloro-phen-yl)-3,8-dimeth-oxy-acenaphthene.

In the title compound, C(40)H(32)Cl(2)O(4), the two chloro-benzene 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.

2,7-Dimeth-oxy-1,8-bis-(4-phen-oxy-benzo-yl)naphthalene.

In the title mol-ecule {systematic name: [2,7-dimethoxy-8-(4-phenoxybenzoyl)naphthalen-1-yl](4-phenoxyphenyl)methan-one}, C(38)H(28)O(6), the 4-phen-oxy-benzoyl units adopt a syn orientation with respect to the naphthalene ring system. The inter-nal benzene rings, A and B, make dihedral angles of 86.72 (5) and 79.

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

The asymmetric unit of the title compound, C(19)H(16)O(3), contains three independent conformers. Each of the three conformers has essentially the same feature of non-coplanar aromatic rings whereby the aroyl group at the 1-position of the naphthalene ring is twisted in a perpendicular manner to the naphthalene ring. The dihedral angles between the benzene ring planes and the naphthalene ring systems are 75.

2-(2,7-Dimeth-oxy-1-naphtho-yl)benzoic acid.

In the title compound, C(20)H(16)O(5), the dihedral angle between the naphthalene ring system and the benzene ring is 67.43 (5)°. The bridging carbonyl C-C(=O)-C plane makes dihedral angles of 82.

Methyl 4-(2,7-dimeth-oxy-1-naphtho-yl)benzoate.

In the title compound, C(21)H(18)O(5), the dihedral angle between the naphthalene ring system and the benzene ring is 86.65 (6)°. The bridging carbonyl C-C(=O)-C plane makes dihedral angles of 83.