1,2,7,8- and 1,3,6,8-Tetramethylcarbazole have been isolated from a fraction of a Kuwait mineral oil and identified by comparison with synthetic specimens obtained by photocyclisation of tetramethyldiphenylamines. A pentamethylcarbazole was also isolated, and was not identical with synthetic 1,2,3,5,7-pentamethylcarbazole.
W. Carruthers, J. Chem. Soc. C, 1968, 2244 DOI: 10.1039/J39680002244
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