Ran-Zhe Lu

Methyl 2-amino-4-(3-chloro­prop­oxy)-5-methoxy­benzoate

The asymmetric unit of the title compound, C12H16ClNO4, contains two crystallographically independent molecules. The benzene rings of the two independent molecules are oriented at a dihedral angle of 88.50 (3)°. Intramolecular N—H⋯O hydrogen bonds involving the methoxybenzoate carbonyl group in each molecule result in the formation of two planar, six-membered rings, oriented at dihedral angles of 1.39 (3) and 0.68 (3)° with respect to the adjacent benzene rings. In the crystal structure, intermolecular N—H⋯O hydrogen bonds link the molecules into chains along the a axis.

2-[2-(4-Nitro­phenyl)hy­dra­zin­yl­idene]malononitrile

The title compound, C10H8N8, is close to planar (r.m.s. deviation from the mean plane = 0.118 Å). In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds generate R 2 2(12) loops.

Methyl 4-but­oxy-3-methoxy­benzoate

The title compound, C13H18O4, is an intermediate product in the synthesis of quinazoline derivatives. Crystal structure analysis shows that the benzene–butoxy Car—O—C—C torsion angle is 175.3 (2)° and that the benzene–methoxycarbonyl Car—C—O—C torsion angle is 175.2 (2)°. Torsion angles close to 180° indicate that the molecule is almost planar.

5-Chloro­pyrimidin-2-amine

The complete molecule of the title compound, C4H3ClN3, is generated by crystallographic mirror symmetry, with the Cl atom, one N atom and two C atoms lying on the reflecting plane. In the crystal structure, intermolecular N—H⋯N hydrogen bonds link the molecules into chains propagating in [100].

Methyl 4-(3-chloro­prop­oxy)-5-meth­oxy-2-nitro­benzoate

The asymmetric unit of the title compound, C12H14ClNO6, contains two crystallographically independent molecules, in which the benzene rings are oriented at a dihedral angle of 9.12 (3)°. In the crystal structure, weak intermolecular C—H⋯O hydrogen bonds link the molecules into a three-dimensional network.

Bis{6-[4-(2-ethyoxyphenyl-diazen-yl)phen-oxy]hexa-nol} monohydrate.

The asymmetric unit of the title compound, 2C20H26N2O3·H2O, contains two independent molecules and one water molecule. The azo bonds adopt trans conformations and the dihedral angles between the aromatic rings in the two organic molecules are 4.5 (2) and 1.5 (2)°. In the crystal structure, O—H⋯O and C—H⋯O hydrogen bonds help to establish the packing.

2-{3,4-Dibut­oxy-5-[5-(3-methyl­phen­yl)-1,3,4-oxadiazol-2-yl]thio­phen-2-yl}-5-(3-methyl­phen­yl)-1,3,4-oxadiazole

In the title compound, C30H32N4O4S, the dihedral angles between the central thiophene ring and the pendant oxadiazole rings are 10.1 (2) and 6.8 (3)°. The dihedral angles between each oxadiazole ring and its adjacent benzene ring are 6.8 (2) and 5.3 (3)°.

Methyl 4-(3-chloro-prop-oxy)-3-methoxy-benzoate.

In the title compound, C12H15ClO4, the molecules are linked by C—H⋯O interactions.

4-[4-(4-Nitro-phenyl-diazen-yl)phen-yl]hexa-nenitrile.

In the molecule of the title compound, C18H18N4O2, the aromatic rings are oriented at a dihedral angle of 3.72 (3)°. In the crystal structure, intermolecular C—H⋯O hydrogen bonds link the molecules into centrosymmetric dimers. There are also C—H⋯π interactions.

Methyl 5-meth-oxy-2-nitro-4-[3-(piperidin-1-yl)prop-oxy]benzoate.

In the molecule of the title compound, C17H24N2O6, the dihedral angle between the four coplanar atoms of the piperidine ring and the benzene ring is 39.2 (1)°.