2-[1-(1-Phenyl­eth­yl)imidazolidin-2-yl­idene]malononitrile

In the title compound, C₁₄H₁₄N₄, the imidazolidine moiety is nearly planar, having an N—C—N—C torsion angle of 4.43 (3)°. The crystal structure is characterized by classical N—H...N hydrogen bonds, which form inversion dimers.

(E)-2-Bromo-4-[(1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)imino­meth­yl]-6-meth­oxy­phenyl 4-methyl­benzene­sulfonate

In the title compound, C₂₆H₂₄BrN₃O₅S, the central benzene ring makes dihedral angles of 6.27 (6), 33.63 (6) and 69.31 (5)°, respectively, with the pyrazolone ring, the bromo­benzene ring and the terminal phenyl ring. An intra­molecular C—H...O hydrogen bond occurs. The crystal packing features weak non-classical C—Br...O inter­actions [Br...O = 3.222 (2) Å] that form inversion-related dimers.

N-(5-Chloro-1,3-thia­zol-2-yl)-2,4-difluoro­benzamide

The title compound, C₁₀H₅ClF₂N₂OS, was obtained by linking an amino heterocycle and a substituted benzoyl chloride. The dihedral angle between the two rings is 41.2 (2)° and the equalization of the amide C—N bond lengths reveals the existence of conjugation between the benzene ring and the thia­zole unit. In the crystal, pairs of N—H...N hydrogen bonds link mol­ecules into inversion dimers. Non-classical C—H...F and C—H...O hydrogen bonds stabilize the crystal structure.