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In the title compound, C20H14N2, the presence of adjacent phenyl rings causes an out-of-plane twist in the quinoxaline system of approximately 12°.

The structure of the title compound, C23H19N3O3, has been determined as part of our study on the synthesis and crystallography of triazole derivatives. The hydroxyl group is involved in an O—H...N intermolecular interaction.

In the title moleclue, C6H7N3, the mean plane of the dimethylamino group [maximum deviation = 0.006 (2) Å] forms a dihedral angle of 7.95 (18)° with the mean plane of the propanedinitrile fragment [maximum deviation = 0.008 (2) Å]. In the crystal, weak C—H...N hydrogen bonds link the molecules into a three-dimensional network.

In the title molecule, C17H13FN2O2, the 3,4-dihydropyrimidine ring adopts a flattened sofa conformation with the flap atom (which bears the fluorophenyl substituent) deviating from the plane defined by the remaining five ring atoms by 0.281 (2) Å. This plane forms dihedral angles of 85.98 (6) and 60.63 (6)° with the 4-fluorophenyl and benzoyl-phenyl rings, respectively. The dihedral angle between the 4-fluorophenyl group and the benzene ring is 71.78 (6)°. In the crystal, N—H...O hydrogen bonds link molecules into inversion dimers that are further connected by another N—H...O interaction into a two-dimensional supramolecular structure parallel to (101).

In the title molecule, C23H26FNO2, the central ring of the acridinedione system adopts a slight boat conformation and the four essentially planar atoms of this ring [maximum deviation = 0.019 (1) Å] form a dihedral angle of 89.98 (6)° with the benzene ring. The two outer rings of the acridinedione system adopt sofa conformations. In the crystal, N—H...O hydrogen bonds link the molecules, forming chains along [001].

The structure of 2,6-di­methyl­quinolin-4(1H)-one, C11H11NO, has been determined as part of our study on the synthesis and crystallography of quinoline and quinazoline derivatives. It crystallizes in the monoclinic space group P21/c. The mol­ecule is planar, with the dihedral angle between the planes of the two rings being 2 (1)°.

The title mol-ecule, C(17)H(14)F(3)NO(4), consists of two nearly planar fragments, viz. the 2-benzyl-oxypyridine (r.m.s. deviation 0.016 Å) and (E)-3-meth-oxy-prop2-enoic (r.m.s. deviation 0.004 Å) units, which form a dihedral angle of 84.19 (7)°. In the crystal, pairs of O-H⋯O hydrogen bonds link mol-ecules into dimers that are further connected by C-H⋯O and C-H⋯F inter-actions into (001) layers. In addition, π-π stacking inter-actions are observed within a layer between the pyridine and benzene rings [centroid-centroid distance = 3.768 (2) Å]. The F atoms of the trifluoro-methyl group are disordered over two sets of sites in a 0.53 (4):0.47 (4) ratio.

In the title compound, C(7)H(10)N(2)O(2), the dimethyl-amino group is twisted slightly relative to the acrylate fragment, forming a dihedral angle of 11.6 (1)°. In the crystal, molecules are linked via pairs of bifurcated C-H/H⋯O hydrogen bonds, forming inversion dimers, which are further connected by C-H⋯N hydrogen bonds into chains along the a-axis direction.