In the title compound, C26H19NO, the plane of the aromatic heterocycle makes a dihedral angle of 75.22 (4)° with that of the attached phenyl ring. In the crystal, mol-ecules are connected by C-H⋯O inter-actions, generating R 2 (2)(12) dimers. These dimers are further connected by C-H⋯π inter-actions, linking the mol-ecules into chains running along the a-axis direction.

The carbazole unit of the title mol-ecule, C(12)H(10)ClNO, is not planar. The dihedral angle between the benzene and pyrrole rings is 1.35 (10)°. The cyclo-hexene ring adopts an envelope conformation. In the crystal structure, inter-molecular N-H⋯O hydrogen bonds form centrosymmetric dimers.

In the title compound, C(10)H(9)IO, the asymmetric unit contains two mol-ecules, in which the iodo-bearing six-membered rings adopt envelope conformations [displacements of the flap atoms = 0.419 (3) and 0.431 (3) Å]. In both mol-ecules, the I atoms are disordered over two set of sites in 0.54 (4):0.46 (4) and 0.71 (3):0.29 (3) ratios. In the crystal, the packing features a weak C-H⋯π inter-act...

In the title compound, C23H17FO2, the cyclo-hexenone ring has an envelope conformation, the flap atom being the C atom to which the phenyl ring is attached. The 4-fluoro-benzoyl ring and the phenyl ring are inclined to one another by 28.77 (7)°, and by 52.00 (7) and 44.77 (7) °, respectively, to the aromatic ring fused to the cyclo-hexenone ring. In the crystal, mol-ecules are linked via C-H⋯O ...

In the title compound, C(19)H(18)O, the exocyclic C=C double bond has an E configuration. The ethyl substituent on the cyclo-hexa-none ring is in an axial position. The cyclo-hexa-none ring adopts a half-chair conformation, presumably due to conjugation in the benzene ring.