1, 8-Dicarbonylcarbazoles are important starting materials for various applications, especially for pincer-type ligands. The convenient synthesis of a series of 1, 8-diacyl-3, 6-di-tert-butyl-9H-carbazoles (2) by the direct Friedel-Crafts acylation of 3, 6-di-tert-butyl-9H-carbazole (1) is described. During the reaction, the dealkylation also occurred, and 1, 8-diacetyl-3-tert- butyl-9H-carbazole (4) was isolated as well as characterized by an X-ray diffraction analysis. In addition, the steric bulkiness of the acyl chlorides strongly affects the yields of 1, 8-diacylation of 1.
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