Li-Ping Cao

N-[(E)-4-Pyridylmethyl­ene]-4-[(E)-4-(4-pyridylmethyl­eneamino)benz­yl]aniline tetra­hydrate

The title compound, C25H20N4·4H2O, crystallizes with the organic molecule lying on a twofold rotation axis through the methylene bridge C atom; there are also two water molecules in the asymmetric unit. The crystal structure is stabilized by C—H⋯O, O—H⋯O and O—H⋯N hydrogen bonds, linking the water molecules to each other and to the pyridine N atom.

Diethyl 7,8,18,19-tetra­methyl-2,13-dioxo­hexa­cyclo­[10.10.2.03,24.05,10.014,23.016,21]tetra­cosa-5,7,9,16,18,20-hexa­ene-23,24-dicarboxyl­ate

The asymmetric unit of the title compound, C30H34N4O6, contains two independent molecules. In one independent molecule, the two ethoxycarbonyl groups are each disordered over two conformations with occupancy ratios of 0.586 (2):0.414 (2) and 0.508 (2):0.492 (2). The crystal packing exhibits weak intermolecular C—H⋯O hydrogen bonds.

Diethyl 2-tert-butyl-6,9-dibromo-4,11-dioxo-5,10-dihydro-cis-1H,3H,4H,11H-2-azo-3a,4a,10a,11a-tetra-aza-benz[f]indeno[2,1,7-ija]azulene-11b,11c-dicarboxyl-ate.

In the title compound, C24H29Br2N5O6, a glycoluril derivative, the 1,4-dibromobenzene ring is fused to the seven-membered ring of the glycoluril unit containing two N atoms. The two five-membered rings in the glycoluril unit are approximately planar and the dihedral angle between them is 69.8 (2)°. The six-membered ring containing three N atoms adopts a chair conformation. The crystal packing is stabilized by an intermolecular non-classical C—H⋯O hydrogen bond and a weak C—H⋯π interaction. Both of the ester groups are found to be disordered over two positions. The occupancies of the disordered positions were refined to 0.73(1):0.27(1) and 0.56(1):0.44(1).

(Z)-2-Methyl­sulfanyl-1,4-di-p-tolyl­but-2-ene-1,4-dione

The title compound, C19H18O2S, displays a trans configuration with respect to the central C=C double bond. The dihedral angle between the two aromatic rings is 67.91 (5)°.