4-Chloro-2-[1-(4-ethyl-phen-yl)-4,5-diphenyl-1H-imidazol-2-yl]phenol.

In the title compound, C29H23ClN2O, the 5-chloro-phenol ring and the imidazole ring are nearly coplanar, with a dihedral angle of 15.76 (9)° between them. The ethyl-phenyl ring and the two phenyl rings subtend angles of 71.09 (7), 43.95 (5) and 36.53 (9)°, respectively, with the imidazole plane. An intra-molecular O-H⋯N hydrogen bond supports the mol-ecular conformation, and an inter-molecular C-H⋯O inter-action, originating from an ortho-phenyl H atom, stabilizes the packing arrangement. In addition, a weak C-H⋯π inter-action, also involving an ortho-phenyl H atom, is observed.

4-Amino-6-(piperidin-1-yl)pyrimidine-5-carbo-nitrile.

In the title compound, C10H13N5, the piperidine ring adopts a chair conformation with the exocyclic N-C bond in an axial orientation, and the dihedral angle between the mean planes of piperidine and pyrimidine rings is 49.57 (11)°. A short intra-molecular C-H⋯N contact generates an S(7) ring. In the crystal, N-H⋯N hydrogen bonds link the mol-ecules into (100) sheets and a weak aromatic π-π stacking inter-action is observed [centroid-centroid separation = 3.5559 (11) Å] between inversion-related pyrimidine rings.

2-[1-(4-tert-Butyl-phen-yl)-4,5-diphenyl-1H-imid-azol-2-yl]-4,6-di-chloro-phenol.

In the title compound, C31H26Cl2N2O, the 4,6-di-chloro-phenol and the imidazole rings are almost coplanar, with a dihedral angle of 8.89 (6)° between them and an intra-molecular O-H⋯N hydrogen bond occurs between the rings. The dihedral angles subtended by the tert-butyl-phenyl ring and the two phenyl rings with the imidazole ring are 85.18 (9), 81.22 (9) and 19.00 (8)°, respectively. The methyl groups of the tert-butyl grouping are disordered over two sets of sites in 0.589 (5):0.411 (5) ratio. In the crystal, inversion dimers linked by pairs of weak C-H⋯Cl inter-actions generate R 2 2(24) loops.