3-Methyl-1-tosyl-1H-indole-2-carbaldehyde

The title indole derivative, C17H15NO3S, crystallizes with two independent molecules in the asymmetric unit. The benzene ring of the tosyl group is almost perpedicular to the indole ring in both molecules, with interplanar angles of 82.60 (5)degrees and 81.82 (6)degrees. The two molecules are, as a consequence, able to form an almost centrosymmetric non-bonded dimer, in which the molecules are linked by pairs of C-H center dot center dot center dot pi interactions. The crystal structure displays a three-dimensional network of C-H center dot center dot center dot O interactions. A pi-pi interaction occurs between inversion-related indole rings with a centroid-centroid distance of 3.6774 (16) angstrom and an interplanar angle of 1.53 (15)degrees. This interaction leads to a stacking of molecules along the a axis.