7-Meth­oxy-2-phenyl­quinoline-3-carbaldehyde

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

2-(4-Chloro­phen­yl)-2,3-di­hydro­quinolin-4(1H)-one

The title mol­ecule, C₁₅H₁₂ClNO, features a di­hydro­quinolin-4(1H)-one moiety attached to a chloro­benzene ring. The heterocyclic ring has a half-chair conformation with the methine C atom lying 0.574 (3) Å above the plane of the five remaining atoms (r.m.s. deviation = 0.0240 Å). The dihedral angles between the terminal benzene rings is 77.53 (9)°, indicating a significant twist in the mol­ecule. In the crystal, supra­molecular zigzag chains along the c-axis direction are sustained by N—H...O hydrogen bonds. These are connected into double chains by C—H...π inter­actions.

2-p-Tolyl-2,3-di­hydro­quinolin-4(1H)-one

In the title mol­ecule, C₁₆H₁₅NO, the tetra­hydro­pyridine ring is in a sofa conformation with the methine C atom forming the flap. The dihedral angle between the benzene rings is 80.85 (8)°. In the crystal, mol­ecules are arranged in alternating double layers parallel to (100) and are connected along [001] by N—H...O hydrogen bonds. In addition, weak C—H...π inter­actions are observed.

3-Anilino-5,5-di­methyl­cyclo­hex-2-enone

In the title mol­ecule, C₁₄H₁₇NO, the 5,5-di­methyl­cyclo­hex-2-enone moiety is attached to an aniline group, the dihedral angle subtended [54.43 (3)°] indicating a significant twist. The hexaneone ring has a half-chair conformation with the C atom bearing two methyl groups lying 0.6384 (8) Å above the plane of the five remaining atoms (r.m.s. deviation = 0.0107 Å). The crystal packing can be described as alternating layers parallel to (-101), which are consolidated by N—H...O hydrogen bonds and C—H...π inter­actions.