Crystal structure of 1,3,6,8-tetra-bromo-9-ethyl-9H-carbazole.

In the title compound, C14H9Br4N, the tricyclic ring system is almost planar (r.m.s. deviation for the 13 non-H atoms = 0.017 Å) and the methyl C atom deviates from the mean plane of the ring system by 1.072 (17) Å. In the crystal, Br⋯Br contacts [3.636 (3) and 3.660 (3) Å] slightly shorter than the van der Waals contact distance of 3.70 Šare seen.

Crystal structure of 3-bromo-9-ethyl-9H-carbazole.

In the title compound, C14H12BrN, the tricyclic ring system is essentially planar (r.m.s. deviation 0.026 Å). The carbon atoms of the ethyl group deviate from the mean plane by 0.148 (9) (CH2) and 1.59 (1) Š(CH3). In the crystal, H⋯π contacts [2.698-2.898 Å] shorter than the van der Waals contact distance of 3.70 Šare observed. A scalable to gram quantities selective synthesis of mono-bromine-substituted carbazole derivatives was developed.