Crystal structure of 1,2-bis-(4-fluoro-phen-yl)-1-hy-droxy-2,3,8-tri-meth-oxy-acenaphthene: formation of a five-membered intra-molecular O-H⋯O hydrogen-bonded ring.

The structure of the title compound, CHFO, at 193 K has triclinic ( ) symmetry. The hy-droxy and meth-oxy groups at the 1,2-positions of the acenaphthene core display a configuration. Both substituents are involved in the formation of a five-membered intra-molecular O-H⋯O hydrogen-bonded ring.

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, CHClO, 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.

1-[(Anthracen-9-yl)carbon-yl]-2,7-di-meth-oxy-naphthalene: a chain-like structure composed of face-to-face type dimeric mol-ecular aggregates.

The asymmetric unit of the title compound, CHO, contains two independent mol-ecules ( and ). The anthracene ring system is connected to the 2,7-di-meth-oxy-naphthalene core in a twisted manner, with dihedral angles of 86.38 (5) and 79.

Crystal structure of 1-(2-fluoro-benzo-yl)-2,7-di-meth-oxy-naphthalene.

The asymmetric unit of the compound, C19H15FO3, contains two independent molecules. Each molecule has essentially the same feature of non-coplanarly accumulated aromatic rings whereby the aroyl group at the 1-position of the naphthalene ring system is twisted almost perpendicularly to the ring system [dihedral angles of 86.52 (8) and 89.

Crystal structure of 1,8-dibenzoyl-2,7-di-phen-oxy-naphthalene.

In the title compound, C36H24O4, the benzene rings of the benzoyl and phen-oxy groups make dihedral angles of 75.01 (4), 75.78 (4), 83.

Comparative structural analysis of 2,7-diethoxy-1,8-bis(4-phenoxybenzoyl)naphthalene and its homologues: orientation of the 4-phenoxybenzoyl groups at the 1- and 8-positions of the naphthalene ring.

The title molecule, C40H32O6, possesses crystallographically imposed twofold symmetry, with the central two C atoms of the naphthalene unit sited on the rotation axis. The two 4-phenoxybenzoyl groups in the molecule are twisted away from the attached naphthalene unit, with a torsion angle of 66.76 (15)° between the naphthalene unit and the carbonyl group (C-C-C=O), and are oriented in mutually opposing directions (anti orientation).

Crystal structure of 2,7-dieth-oxy-1,8-bis-(4-nitro-benzo-yl)naphthalene.

The title compound, C28H22N2O8, possesses crystallographically imposed twofold symmetry, with the two central carbon atoms of the naphthalene unit lying on the rotation axis. The two benzoyl groups in the mol-ecule are twisted away from the attached naphthalene unit with a C-C-C=O torsion angle of 49.05 (15)° between the naphthalene unit and the carbonyl group.

Head-to-tail square-shaped cyclic hydrogen bonds leading to dimeric aggregates: 1,8-dibenzoyl-2,7-dihydroxynaphthalene and a comparison with its analogous benzoylnaphthalene.

The title compound, C24H16O4, crystallized with two independent molecules in the asymmetric unit. Both carbonyl groups in these molecules form intramolecular O-H..

(2,7-Di-meth-oxy-naphthalen-1-yl)(naph-thalen-1-yl)methanone.

The asymmetric unit of the title compound, C23H18O3, contains two independent mol-ecules (A and B). Each mol-ecule has essentially the same conformation (r.m.

(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-Dieth-oxy-8-[(naphthalen-1-yl)carbon-yl]naph-thalen-1-yl}(naphthalen-1-yl)methanone.

In the title compound, C36H28O4, the 1-naphthoyl groups at the 1- and 8-positions of the central 2,7-dieth-oxy-naphthalene ring system are aligned almost anti-parallel and make a dihedral angle of 76.59 (4)°. The dihedral angles between the central 2,7-dieth-oxy-naphthalene ring system and the terminal naphthalene ring systems are 86.

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

The title compound, C32H32O6, crystallized with two independent molecules in the asymmetric unit. Each molecule has essentially the same feature of non-coplanar aromatic rings whereby the two 4-isopropoxybenzoyl groups are twisted in a perpendicular manner to the naphthalene ring and oriented in the same direction (syn-orientation). The benzene rings of the aroyl groups make dihedral angles of 16.

(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.

(8-Benzoyl-2,7-dimeth-oxy-naphthalen-1-yl)(4-phen-oxy-phen-yl)methanone.

In the mol-ecule of the title compound, C32H24O5, the benzoyl group and the 4-phenoxy substituted benzoyl group at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel. The two benzene rings make a dihedral angle of 21.18 (10)°, and are inclined to the naphthalene ring system by 86.

{2,7-Dieth-oxy-8-[(naphthalen-2-yl)carbon-yl]naphthalen-1-yl}(naphthalen-2-yl)methanone.

In the title compound, C36H28O4, the two 2-naphthoyl groups at the 1- and 8-positions of the central 2,7-dieth-oxy-naphthalene ring system are aligned almost anti-parallel and make a dihedral angle of 48.35 (5)°. The dihedral angles between the central 2,7-dieth-oxy-naphthalene ring system and the terminal naphthalene ring systems are 77.

(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.

(8-Benzoyl-2,7-dieth-oxy-naphthalen-1-yl)(phen-yl)methanone.

In the title compound, C28H24O4, the 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 20.03 (7)°. The dihedral angles between the benzene rings and the naphthalene ring system are 68.

[2,7-Dimeth-oxy-8-(4-meth-oxy-benzo-yl)naphthalen-1-yl](4-meth-oxy-phen-yl)methanone chloro-form monosolvate.

In the title compound, C28H24O6·CHCl3, the two 4-meth-oxy-benzoyl groups at the 1- and 8-positions of the naphthalene ring system are aligned almost anti-parallel, the benzene rings making a dihedral angle of 25.76 (7)°. The naphthalene ring system makes dihedral angles of 72.

{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.