Km. Biswas et al., A CONVENIENT SYNTHESIS OF 1-DIMETHYL-6-TRIFLUOROMETHYLINDOLO[3,2-B]CARBAZOLE, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 37(9), 1998, pp. 841-843
On treatment with TFAA, both N,N'-dimethyl-3,3'-diindolylmethane and N
-methylindole-3-methanol give 1-dimethyl-6-trifluoromethylindolo[3,2-b
]carbazole along with three other products.