1-(4-Chloro­phen­yl)-2-(1,3-diazepan-2-yl­idene)ethanone

In the title compound, C₁₃H₁₅ClN₂O, there are two crystallographically independent but conformationally similar (E)-mol­ecules in the asymmetric unit [dihedral angles between the phenyl ring and a common planar fragment of the 1,3-diazepane moiety = 47.34 (16) and 48.00 (16)°]. The seven-membered ring system adopts a chair conformation in both molecules. In the crystal, N—H...O hydrogen bonds lead to chains extending along the b-axis direction.

[6-(Furan-2-yl)-7-nitro-2,3,4,6,7,8-hexa­hydro-1H-pyrido[1,2-a]pyrimidin-9-yl](phen­yl)methanone

The asymmetric unit of the title compound, C₁₉H₁₉N₃O₄, contains two mol­ecules with very few conformational differences; a C atom in the pyrimidine ring in one of the mol­ecules is disordered in a 0.688 (15):0.312 (15) ratio. In both mol­ecules, the fused pyridine and pyrimidine rings adopt half-chair conformations. The dihedral angles between the furan and benzene rings are 81.00 (13) and 84.99 (10)° in the two mol­ecules. The mol­ecular structure is consolidated by intra­molecular N—H...O hydrogen bonding. In the crystal, C—H...O hydrogen bonds connect the molecules into a three-dimensional network.

3,3-Bis(methyl­sulfan­yl)-1-(4-nitro­phen­yl)prop-2-en-1-one

In the title compound, C₁₁H₁₁NO₃S₂, the S—Csp² bonds are shorter [1.746 (3) and 1.750 (2) Å] than the S—CH₃ bonds [1.794 (3) and 1.806 (3) Å], which we attribute to d–π inter­actions between the S atoms and the C=C bond. The 1,1-bis­(methyl­sulfan­yl)-3-oxo­propyl­ene fragment and the 4-nitro­phenyl group are both almost planar, with the largest deviations from their mean planes being 0.053 (1) and 0.017 (2) Å, respectively. The dihedral angle between the two planes is 35.07 (7)°. Mol­ecules in the crystal are linked into a three-dimensional network by C—H...S and C—H...O hydrogen bonds.