Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Alkyl, vinyl and aryl substituted carbazoles at the 3- and 6-positions are prepared in high yield from the corresponding 3,6-dibromocarbazole via nickel catalyzed coupling with Grignard reagents (Corriu-Kumada coupling). ... 3,6-Disubstituted carbazoles with alkyl, vinyl and aryl ...