N-(o-Chloro­phenyl)-2,5-di­methyl­pyrrole-3-carb­aldehyde

Crystal structure analysis of the title compound, C₁₃H₁₂ClNO, reveals three crystallographically independent mol­ecules in the asymmetric unit. The main conformational difference between these mol­ecules is the orientation of the phenyl rings with respect to the pyrrole rings. The coplanar arrangement of the aldehyde groups attached to the pyrrole rings influences the pyrrole-ring geometry. The C2-C3 and N1-C5 bonds are noticeably longer than the C4-C5 and N1-C2 bonds. Two independent mol­ecules of the title compound form dimers via intermolecular C-H...O hydrogen bonds [D...A = 3.400 (3) Å and D-H...A = 157°]. The perpendicular orientation of the phenyl and pyrrole rings of one independent mol­ecule and its symmetry-related mol­ecule allows C-H...[pi] interactions, with an H...centroid distance of 2.85 Å and a C-H...[pi] angle of 155°. The distances between the H atom and the pyrrole-ring atoms indicate that the C-H bond points towards one of the bonds in the pyrrole ring.