1,2-Di-2-quinolylethene

The title compound, C20H14N2, comprises two crystallographically independent centrosymmetric mol­ecules (A and B) with different conformations due to the disorder of molecule B. The whole of mol­ecule B is disordered over two sets of positions, corresponding to a 180° rotation of the molecule, with a site-occupancy ratio of 0.780 (6):0.220 (6). The minor component of the disordered part in B has the same configuration as mol­ecule A, but the major component is different. The dihedral angle between the planes of mol­ecule A and mol­ecule B (major component) is 63.22 (3)°. The crystal structure is stabilized by inter­molecular C—H⋯π inter­actions

2-(7-Hydr­oxy-2-naphth­yloxy)-N-(6-methyl-2-pyrid­yl)acetamide

In the title compound, C18H16N2O3, the dihedral angle between the naphthalene ring system and the pyridyl ring is 18.1 (8)°. The mol­ecules are inter­connected via C—H⋯O and O—H⋯O hydrogen bonds. Inversion-related mol­ecules are linked by O—H⋯O hydrogen bonds into cyclic centrosymmetric R 2 2(22) dimers. Intra­molecular N—H⋯O hydrogen bonding produces an S(5) ring motif. The crystal structure is further stabilized by weak C—H—π inter­actions

N-[6-(Dibromo­meth­yl)-2-pyrid­yl]-2,2-dimethyl­propionamide

In the mol­ecular structure of the title compound, C11H14Br2N2O, the dimethyl­propionamide substituent is twisted slightly with respect to the pyridine ring, the inter­planar angle being 12.3 (2)°. The dibromo­methyl group is orientated in such a way that the two Br atoms are tilted away from the pyridine ring. In the crystal structure, mol­ecules are associated into supra­molecular chains by weak C—H⋯O inter­actions. The crystal is further stabilized by weak N—H⋯Br and C—H⋯N inter­actions