N-bromobutanimide → 3-Bromo-9-phenylcarbazole

Participants

Reaction Steps

Firstly, 24.3 g (100 mmol) of N-phenylcarbazole was dissolved in 600 ml of glacial acetic acid, and 17.8 g (100 mmol) of N-bromo succinic acid imide was slowly added thereto. The mixture was stirred for about 12 hours at a room temperature. This glacial acetic acid solution was dropped in one litter of ice water while stirring them. A precipitated white solid was washed three times with water. This solid was dissolved in 150 ml of diethyl ether, and washed with a saturated sodium hydrogencarbonate solution and water. This organic layer was dried with magnesium sulfate, and filtered. The obtained filtrate was concentrated. The thus obtained residue was recrystallized with methanol to obtain 28.4 g (the yield: 88%) of 3-bromo-9-phenylcarbazole, which was a white powder (Synthesis scheme (c-1)).

Provenance & Evidence