STRUCTURAL INVESTIGATIONS OF 1,2,3,4-TETRAHYDROCARBAZOLE DERIVATIVES .1. 2,3-DIHYDRO-9-(PHENYLSULFONYL)CARBAZOLE-4(1H)-ONE AND 1,2,3,4-TETRAHYDRO-CARBAZOLE-1-SPIRO-2'-[1,3]DITHIOLANE
ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS, vol.50, pp.450-453, 1994 (SCI-Expanded)
Rings A and B of the title compounds, C18H15NO3S (1) and C14H15NS2 (2), are planar while the hydrogenated C rings are not. The rings in the tetrahydrocarbazole skeleton are twisted with respect to each other.