... Expectedly, the reactions of 2′-substituted 1n–p gave exclusively 4-substituted carbazoles 2n–p in good yields (entries 14–16). ... Thus, treatment of 1a (0.25 mmol) with 3,6-di-tert-butyl- (2w) and 3,6-dichlorocarbazoles (2x) (0.25 mmol) in the presence of [Cp*IrCl 2 ] 2 (0.01 mmol ...