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The general procedure for the synthesis of 3,6-diiodo-9-phenylcarbazole from N-phenylcarbazole was as follows: first, 24.3 g (100 mmol) of 9-phenylcarbazole was dissolved in 700 mL of glacial acetic acid, followed by the slow addition of 44.9 g (200 mmol) of N-iodosuccinimide. The reaction mixture was stirred at room temperature overnight. Upon completion of the reaction, the resulting precipitate was collected by filtration and the residue was washed sequentially with saturated aqueous sodium bicarbonate solution, water and methanol and finally dried. 47.0 g (95% yield) of the target product 3,6-diiodo-9-phenylcarbazole was obtained as a white powder.

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