In the title compound, C(17)H(15)NO, the benzene ring and the indole system are almost perpendicular, making a dihedral angle of 87.82 (6)°. The crystal packing is stabilized by C-H⋯O and π-π stacking inter-actions with centroid-centroid distances of 3.592 (4) Å between the pyrrole and the benzene rings in the indole systems of neighboring mol-ecules.

The benzo[h]quinolinyl fused-ring of the title compound, C(14)H(8)ClNO, is planar (r.m.s. deviation = 0.016 Å); the formyl group is slightly bent out of the plane [the C-C-C-O torsion angle is 10.7 (4)°].

In the title mol-ecule, C17H13NO2, the phenyl ring is inclined to the quinoline ring system by 43.53 (4)°. In the crystal, mol-ecules are linked via C-H⋯O hydrogen bonds, forming double-stranded chains propagating along [011]. These chains are linked via π-π inter-actions involving inversion-related quinoline rings; the shortest centroid-centroid distance is 3.6596 (17) Å.

Simple and rapid synthesis of various diversely functionalized unprotected 4-amino-2-chloroquinoline-3-aryl derivatives were synthesized in high yields by Suzuki cross-coupling reaction using microwave irradiation in water and in presence of tetrakis(triphenylphosphine)palladium(0). Electronic effects of o-substituted functional groups on the reaction were studied conclusively.

(Z)-3-(1H-Indol-3-yl)-2-(3-thienyl)acrylonitrile, C15H10N2S, (I), and (Z)-3-[1-(4-tert-butylbenzyl)-1H-indol-3-yl]-2-(3-thienyl)acrylonitrile, C26H24N2S, (II), were prepared by base-catalyzed reactions of the corresponding indole-3-carboxaldehyde with thiophene-3-acetonitrile. 1H/13C NMR spectral data and X-ray crystal structures of compounds (I) and (II) are presented. The olefinic bond connec...