2-Amino-4-(2-fluoro-phen-yl)-5,6-dihydro-benzo[h]quinoline-3-carbonitrile.

In the title compound, C(20)H(14)FN(3), the F atom of the fluoro-substituted benzene ring in the 4-position of the 5,6-dihydro-benzo[h]quinoline system is disordered over two positions (0.80 and 0.20 occupancy).

2-Amino-4-(4-fluoro-phen-yl)-6-(naphthalen-1-yl)pyridine-3-carbonitrile.

The title compound, C(22)H(14)FN(3), was prepared by a one-pot condensation using malononitrile, an aromatic aldehyde, a methyl ketone and ammonium acetate as reacta-nts under microwave irradiation. The pyridine ring is twisted with respect to the benzene ring and the naphthalene ring system, making dihedral angles of 41.9 (1) and 45.

tert-Butyl N-{4-methyl-3-[4-(3-pyrid-yl)pyrimidin-2-yl-oxy]phen-yl}carbamate.

In the mol-ecule of the title compound, C(21)H(22)N(4)O(3), the pyrimidine ring is oriented at dihedral angles of 0.51 (3) and 50.76 (3)° to the pyridine and benzene rings, respectively.

Methyl 4-anilino-3-nitro-benzoate.

In the mol-ecule of the title compound, C(14)H(12)N(2)O(4), the aromatic rings are oriented at a dihedral angle of 51.50 (4)°. An intra-molecular N-H⋯O inter-action results in the formation of a six-membered ring having an envelope conformation.

4-Methyl-3-[4-(3-pyrid-yl)pyrimidin-2-yl-oxy]aniline.

In the title compound, C(16)H(14)N(4)O, there are inter-molecular N-H⋯N hydrogen bonds which may be effective in stabilizing the crystal. The title compound is an important medicament and is used in the synthesis of anti-tumour drugs.

Ethyl 4-ethyl-amino-3-nitro-benzoate.

In the mol-ecule of the title compound, C(11)H(14)N(2)O(4), a bifurcated intra/intermolecular N-H⋯(O,O) hydrogen bond occurs.The intramolecular component results in a non-planar six-membered ring with a flattened-boat conformation. In the crystal structure, the inter-molecular interaction links the mol-ecules into chains parallel to the b axis.

4-Chloro-3-nitro-benzonitrile.

In the title compound, C(7)H(3)ClN(2)O(2), the Cl, C and N atoms are coplanar with the aromatic ring. In the crystal structure, weak inter-molecular C-H⋯O and C-H⋯N hydrogen bonds link the mol-ecules. The π-π contact between the benzene rings, [centroid-centroid distances = 3.

Ethyl 4-anilino-3-nitrobenzoate.

In the title compound, C(15)H(14)N(2)O(4), the aromatic rings are oriented at a dihedral angle of 78.33 (3)°. An intra-molecular N-H⋯O hydrogen bond results in a non-planar six-membered ring with a flattened-boat conformation.

4-Chloro-3-nitro-benzamide.

In the crystal of the title compound, C(7)H(5)ClN(2)O(3), the molecules are linked by N-H⋯O and C-H⋯O hydrogen bonds. The π-π contact between the benzene rings, [centroid-centroid distance = 3.803 (3) Å] may further stabilize the structure.

5-Bromo-2-methyl-pyridine N-oxide.

In the mol-ecule of the title compound, C(6)H(6)BrNO, the methyl C and oxide O atoms lie in the pyridine ring plane, while the Br atom is displaced by 0.103 (3) Å. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into centrosymmetric dimers.

Tri-p-tolyl-phosphine.

In the title compound C(21)H(21)P, the P atom is situated on a crystallographic threefold rotatory-inversion axis, resulting in threefold rotation symmetry of the title compound. The dihedral angles between the symmetry-related benzene rings are 87.40 (18)°.

(Z)-5-(4-Fluoro-benzyl-idene)-1,3-thia-zolidine-2,4-dione.

In the title compound, C(10)H(6)FNO(2)S, the benzene and thia-zolidine rings make a dihedral angle of 7.52 (3)°. Intra-molecular C-H⋯O and C-H⋯S hydrogen bonds result in the formation of nearly planar five- and six-membered rings; the adjacent rings are nearly coplanar.

Ethyl 4-chloro-3-nitro-benzoate.

In the mol-ecule of the title compound, C(9)H(8)ClNO(4), an intra-molecular C-H⋯O hydrogen bond results in the formation of a planar five-membered ring, which is nearly coplanar with the adjacent six-membered ring, the rings being oriented at a dihedral angle of 4.40 (3)°. In the crystal structure, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules.

Methyl 4-chloro-3-nitro-benzoate.

In the title compound, C(8)H(6)ClNO(4), the mol-ecules are linked by C-H⋯O inter-actions to form a chain parallel to the a axis. The chains are further connected by slipped π-π stacking between symmetry-related benzene rings, with a centroid-to-centroid distance of 3.646 (2) Å and an inter-planar distance of 3.