3-(4-Bromo­phen­yl)-1-(4-chloro­benz­yl)-1H-pyrazole-5-carbaldehyde

The title compound, C₁₇H₁₂BrClN₂O, was synthesized by oxidation of [3-(4-bromo­phen­yl)-1-(4-chloro­benz­yl)-1H-pyrazol-5-yl]methanol under mild conditions. The pyrazole ring makes dihedral angles of 3.29 (9) and 74.91 (4)°, respectively, with the bromo­phenyl and chloro­phenyl rings.

4-Acetyl-1H-pyrrole-2-carbaldehyde

The title compound, C₇H₇NO₂, was synthesized via a one-pot Vilsmeier–Haack and subsequent Friedel–Crafts reaction. The pyrazole ring makes dihedral angles of 4.50 (9) and 2.06 (8)°, respectively, with the aldehyde and acetyl groups. In the crystal, classical N—H...O hydrogen bonds and weak C—H...O inter­actions assemble the mol­ecules into a chain along the b axis.

1-(1-Benzyl-1H-benzimidazol-2-yl)ethanone

In the title compound, C₁₆H₁₄N₂O, the benzimidazole ring system is essentially planar. The planes of the benzene rings make a dihedral angle of 85.92 (8)°. In the crystal, neighbouring molecule are connected into paris along the c axis by weak C—H...O interactions and the connected pairs are expanded through C—H...N hydrogen bonds and C—H...π interactions along the b axis.