3-(2-Meth­oxy­naphthalen-1-yl)-2-benzofuran-1(3H)-one

The asymmetric unit of the title compound, C19H14O3, contains two crystallographically independent mol­ecules in which the dihedral angles between the naphthalene and benzofuran ring systems are 76.49 (7) and 86.17 (7)°. In the crystal, mol­ecules are linked by inter­molecular C—H⋯O hydrogen-bonding inter­actions into chains running parallel to the a axis. In addition, the crystal packing is stabilized by C—H⋯π inter­actions

(2-Benzoyl­phen­yl)(3,4-dimethyl­phen­yl)methanone

In the title compound, C22H18O2, the central benzene ring forms dihedral angles of 76.0 (1) and 73.1 (1)° with the phenyl ring and dimethyl-substituted benzene ring, respectively. The carbonyl-group O atoms deviate significantly from the phenyl ring and the dimethyl-substituted benzene ring [−0.582 (12) and 0.546 (12) Å, respectively]. The crystal packing is stabilized by C—H⋯π inter­actions

(2-Benzoyl­phen­yl)(2-meth­oxy-1-naphth­yl)methanone

In the title compound C25H18O3, the central benzene ring forms dihedral angles of 87.4 (5) and 85.4 (4)° with the phenyl ring and the naphthalene ring system, respectively. The carbonyl O atoms deviate significantly from the phenyl ring and the meth­oxy-substituted naphthalene ring system [by 0.508 (1) and 0.821 (1) Å, respectively]. The crystal packing is stabilized by C—H⋯O hydrogen bonds, which generate C(6) chains, and C—H⋯π inter­actions

[2-(2-Meth­oxy-1-naphtho­yl)phen­yl](1-naphth­yl)methanone

The title compound, C29H20O3, adopts an ‘S’ conformation with a dihedral angle of 68.5 (2)° beween the two acetone planes. The central phenyl ring forms dihedral angles of 83.8 (4) and 84.5 (4)° with the naphthalene and meth­oxy-substituted naphthalene mean planes, respectively. Both carbonyl-group O atoms deviate significantly from the naphthalene moiety and the meth­oxy-substituted naphthalene moiety [0.574 (1) and −1.053 (1) Å, respectively]. The crystal packing is stabilized by C—H⋯O inter­molecular inter­actions, generating C(7) chain and R 2 2(10) graph-set motifs

(Biphenyl-4-yl)[2-(4-methyl­benzo­yl)phen­yl]methanone

In the title compound, C27H20O2, the central benzene ring makes dihedral angles of 64.86 (7) and 70.35 (7)° with the methyl-substituted ring and the biphenyl ring system, respectively. The crystal packing is stabilized by inter­molecular C—H⋯O inter­actions, which link the mol­ecules into chains parallel to the b axis

(4-Methyl­phen­yl)[2-(thio­phen-2-ylcarbon­yl)phen­yl]methanone

The crystal studied of the title compound, C19H14O2S, was an inversion twin with a 0.7 (1):0.3 (1) domain ratio. The central benzene ring makes dihedral angles of 63.31 (9) and 60.86 (9)°, respectively, with the 4-methyl­phenyl and thio­phene rings. In the crystal, mol­ecules are linked by weak inter­molecular C—H⋯O hydrogen bonds and S⋯π [3.609 (3) Å] inter­actions

[2-(3,4-Dimethylbenzoyl)phenyl](4-methoxyphenyl)methanone

The title molecule, C23H20O3, is disordered with a 180° rotation about an axis normal to the length of the molecule, with the major and minor components in a 0.545 (5):0.455 (5) ratio. In the major component, the central benzene ring forms dihedral angles of 72.34 (3) and 69.46 (3)° with the dimethyl-substituted and methoxy-substituted benzene rings, respectively. Moreover, the central benzene ring forms dihedral angles of 50.86 (5) and 58.43 (4)° with the mean planes of the ketone groups. In the minor component, the corresponding dihedral angles between the benzene rings are 71.36 (4) and 67.94 (4)° and the dihedral angles between the benzene ring and the ketone groups are 56.44 (9) and 55.51 (8)°. In the crystal, C—H...O interactions generate a C(9) chain along the a-axis direction

Synthesis of Annulated Arenes and Heteroarenes Involving Lewis Acid-Mediated Regioselective Annulation of Unsymmetrical 1,2-(Diaryl/diheteroarylmethine)dipivalates

A ZnBr₂-mediated regioselective annulation of unsymmetrical 1,2-diarylmethinedipivalates in DCM at room temperature led to the formation of annulated arenes and heteroarenes. The annulation of the dipivalate proceeds through the intermediacy of benzylic carbocations followed by intramolecular cyclization and subsequent aromatization to give the annulated products. The annulation methodology is highly efficient for the syntheses of anthracene as well as naphtho­[<i>b</i>]­thiophene analogues