SEARCH Articles Figures Tables Carbazoles Graebe-Ullmann carbazole-carboline synthesis Carbolines Graebe-Ullmann carbazole-carboline synthesis GOMBERG - BACHMANN - GRAEBE ULLMANN Arylation GOMBERG-BACHMANN-GRAEBE-ULLMANN Graebe and Liebermann Graebe, Carl Graebe-Ullman carbazole synthesis Graebe-Ullman synthesis Graebe-Ullmann carbazole synthesis Graebe-Ullmann carbazole-carboline synthesis Graebe-Ullmann reaction Graebe-Ullmann synthesis