N-[2-(4-Bromo­benzo­yl)eth­yl]isopropyl­aminium chloride

The crystal structure of the title compound, C₁₂H₁₇BrNO⁺·Cl⁻, is stabilized by N—H...Cl and C—H...O hydrogen bonds, forming a three-dimensional network. The inter­actions framework is completed by C—H...π contacts between a methyl­ene group and the benzene ring of a symmetry-related mol­ecule.

(1E,4E)-1-(3-Nitro­phen­yl)-5-phenyl­penta-1,4-dien-3-one

In the title compound, C₁₇H₁₃NO₃, the dihedral angle between the benzene rings is 31.21 (5)°. In the crystal, inversion dimers linked by pairs of C—H...O hydrogen bonds occur. A C—H...π inter­action is also indicated.

(2E)-2-[(3E)-4-Phenyl­but-3-en-2-yl­idene]hydrazinecarboxamide

In the title compound, C₁₁H₁₃N₃O, the phenyl ring is disordered over two sites, with occupancy factors in a 0.520 (17):0.480 (17) ratio. The dihedral angle between the ring planes of the major and minor components of the disordered ring is 12.9 (2)°. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds, forming R₂²(8) ring motifs. C—H...O, C—H...N and C—H...π inter­actions also occur.

3,3-Dimethyl-2-benzofuran-1(3H)-one

In the title compound, C₁₀H₁₀O₂, all the non-H atoms except the methyl C atoms lie on a crystallographic mirror plane. In the crystal, C—H...O hydrogen bonds link the mol­ecules into zigzag chains running parallel to [100]. Weak π–π stacking inter­actions between the benzene rings [centroid–centroid distance = 3.9817 (5) Å] link the chains in the [010] direction.