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Carbazole (1) was discovered in coal tar by GRAEBE and GLASER in 1872. The major development in the chemistry of carbazoles up to 1920 took place in Europe due to its importance in the European dye stuff industry. The use of vinyl carbazoles and its polymerisation products in industry gave further impetus to the studies of carbazole chemistry in the late thirties. Detailed references on the chemistry of carbazoles are available in previous monographs on the subject (56, 103).