In the title compound, C(23)H(22)N(2)O, obtained from the condensation reaction of 4-formyl-benzonitrile, 2-naphthol and piperidine, the dihedral angle between the naphthalene ring system and the benzene ring is 75.31 (4)°. The piperidine ring adopts a chair conformation. The crystal structure is stabilized by inter-molecular C-H⋯N hydrogen bonds, which link the mol-ecules into centrosymmetric ...

The title compound, C(10)H(16)N(4), crystalizes with two mol-ecules (A and B) in the asymmetric unit in which the dihedral angles between the piperidine and pyrimidine rings are 47.5 (1) and 10.3 (1)°. The four C atoms of the pyrimidine ring in one of the mol-ecules are disordered over two sets of sites with occupancy factors 0.508 (11):0.492 (11). In the crystal, the A mol-ecules are linked to...

In the title compound, C20H20Cl2N2O2·H2O, the piperidine ring adopts a chair conformation with the two substituent benzene rings inclined to one another [dihedral angle 84.63 (9)°]. In the crystal, the components are linked by Ow-H⋯O, N-H⋯Ow (w = water) and C-H⋯O hydrogen bonds, generating a sheet structure lying parallel to (101).

In the title compound, C22H27N2O2, the piperidine ring adopts a half-chair conformation with the benzene rings inclined in a trans orientation with respect to the piperidine ring [dihedral angle between the benzene rings = 89.1 (1)°]. In the crystal, a three-centre asymmetric N-H⋯O/C-H⋯O hydrogen-bonding inter-action leads to the formation of chains extending along the a-axis direction.

The asymmetric unit of the title salt, C17H17F6N2O(+)·C10H8F3O3 (-), comprises two piperidin-1-ium cations and two carboxyl-ate anions. The cations, each having an l-shaped conformation owing to the near orthogonal relationship between the quinolinyl and piperidin-1-ium residues, are pseudo-enanti-omeric. The anions have the same absolute configuration but differ in the relative orientations of...