6,7-Dimeth-oxy-2,4-di-phenyl-quinoline.

In the title structure of the title compound, C23H19NO2, two conformationally similar mol-ecules (A and B) comprise the asymmetric unit. The dihedral angle between phenyl rings bridged by the quinoline moiety are 76.25 (8)° in mol-ecule A and 70.39 (9)° in mol-ecule B. In the crystal, the independent mol-ecules are connected by C-H⋯O hydrogen bonds and the resulting dimeric aggregates are linked by π-π [inter-centroid distance = 3.7370 (8) Å] and C-H⋯π inter-actions, forming a three-dimensional architecture.

4-(4,5-Diphenyl-1H-imidazol-2-yl)-N,N-di-methyl-aniline.

The asymmetric unit of the title compound, C23H21N3, consists of two symmetry-independent and conformationally different mol-ecules [the comparable dihedral angles between the imidazole ring and the three benzene rings being 38.5 (2)/61.5 (3)/3.37 (17) and 45.8 (2)/36.01 (19)/46.94 (17)°]. In the crystal, inter-molecular imidazole N-H⋯N hydrogen-bonding inter-actions give a one-dimensional chain extending along [101].

4-[5-(4-Benzoyl-oxyphen-yl)-1,2,4-oxa-diazol-3-yl]phenyl benzoate.

In the title compound, C28H18N2O5, the dihedral angle between the terminal benzoate rings is 20.67 (12)°. The central oxadiazole ring is almost coplanar with its two benzene ring substituents, making dihedral angles of 4.80 (16) and 5.82 (16)°. In the crystal, pairs of C-H⋯O hydrogen bonds form inversion dimers with R 2 (2)(40) ring motifs. The structure also features C-H⋯O, C-H⋯π and π-π inter-actions [centroid-centroid separation = 3.695 (4) Å].

4-[Amino-(3-methyl-phen-yl)methyl-idene]-2-(3-methyl-phen-yl)-1H-imidazol-5(4H)-one ethanol hemisolvate.

In the title compound, C(18)H(17)N(3)O·0.5C(2)H(5)OH, the dihedral angles between the central imidazole rings and the pendant benzene rings are 42.06 (15) and 2.01 (16)° in one asymmetric mol-ecule and 47.91 (15) and 7.31 (14)° in the other. An intra-molecular N-H⋯O hydrogen bond occurs in each imidazole mol-ecule. In the crystal, the components are connected by O-H⋯N, N-H⋯O, C-H⋯O and N-H⋯N hydrogen bonds. Weak aromatic π-π inter-actions also occur [shortest centroid-centroid distance = 3.684 (3) Å].

Ethyl 2-cyano-5-oxo-5-(thio-phen-2-yl)-3-(3,4,5-trimeth-oxy-phen-yl)penta-noate.

In the title compound, C21H23NO6S, the dihedral angle between the thio-pene and benzene rings is 88.66 (6)°. In the crystal, mol-ecules are connected by C-H⋯N and C-H⋯O hydrogen bonds, forming a tape along [10-1]. In addition, C-H⋯π and π-π stacking [centroid-centroid distance = 3.879 (2) Šbetween the thio-phene rings] inter-actions are observed.

2-(4-Chloro-phen-yl)-6-methyl-4-(3-methyl-phen-yl)quinoline.

In the title compound, C(23)H(18)ClN, the dihedral angles between the quinoline unit and the chloro-benzene and methyl-benzene rings are 2.57 (9) and 56.06 (9)°, respectively. The crystal structure is stabilized by π-π inter-actions [minimum ring centroid separation = 3.733 (2) Å].