2-{[4-(Dimethyl-amino)-benzyl-idene]amino}-phenyl disulfide.

In the title mol-ecule, C(30)H(30)N(4)S(2), the two benzene rings connected through the disulfide chain form a dihedral angle of 88.7 (1)°, and the two benzene rings in the benzyl-ideneaniline fragments form dihedral angles of 34.0 (1) and 35.4 (1)°. The crystal packing exhibits no significantly short inter-molecular contacts.

1,5-Bis[1-(2,4-dihy-droxy-phen-yl)ethyl-idene]carbonohydrazide dimethyl-formamide disolvate.

In the title compound, C(17)H(18)N(4)O(5)·2C(3)H(7)NO, two solvent mol-ecules are linked to the main mol-ecule via N-H⋯O and O-H⋯O hydrogen bonds, forming a hydrogen-bonded trimer. Intra-molecular O-H⋯N hydrogen bonds influence the mol-ecular conformation of the main mol-ecule, and the two benzene rings form a dihedral angle of 10.55 (18)°. In the crystal, inter-molecular O-H⋯O hydrogen bonds link hydrogen-bonded trimers into ribbons extending along the b axis.

1,2-Dibenzoyl-hydrazine-dimethyl-formamide (3/1).

The title compound, 3C(14)H(12)N(2)O(2)·C(3)H(7)NO, was synthesized by reaction of benzoyl chloride with hydrazine hydrate under microwave irradition. The asymmetric unit comprises three 1,2-dibenzoyl-hydrazine mol-ecules and one dimethyl-formamide mol-ecule. The 1,2-dibenzoyl-hydrazine mol-ecules are linked by pairs of N-H⋯O hydrogen bonds into chains propagating along [010].

Ethyl 6-(2-chloro-phen-yl)-4-methyl-1-(3-oxobut-yl)-2-thioxo-1,2,3,6-tetra-hydro-pyrimidine-5-carboxyl-ate.

In the title mol-ecule, C(18)H(21)ClN(2)O(3)S, the pyrimidine ring exhibits a half-chair conformation. The ethyl group is disordered between two positions in a ratio 0.74:0.26. In the crystal structure, the mol-ecules are linked into chains along the a axis by N-H⋯O hydrogen bonds.

1,5-Bis(4-bromo-phen-yl)-3-phenyl-pentane-1,5-dione.

The asymmetric unit of the title compound, C(23)H(18)Br(2)O(2), contains two independent mol-ecules with slightly different conformations. In the absence of classical inter-molecular inter-actions, the crystal packing is stabilized by van der Waals forces.

3-Phenyl-1,5-di-2-thienylpentane-1,5-dione.

The asymmetric unit of the title compound, C(19)H(16)O(2)S(2), contains two independent mol-ecules with slightly different conformations. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds [C⋯O = 3.279 (15) and 3.407 (16) Å] link the mol-ecules into chains extended along the c axis.

3-[4-(Dimethylamino)phenyl]-1,5-di-phenylpentane-1,5-dione.

The asymmetric unit of the title compound, C(25)H(25)NO(2), contains two independent mol-ecules. The crystal packing exhibits weak inter-molecular C-H⋯O, C-H⋯π and π-π inter-actions.