3-Bromo-9H-carbazole is an isomer to 2-Bromo-9H-carbazole, with the only difference being that 9H-carbazole is mono-brominated at 3-position. Blocked at 3-position, 3-Bromo-9H-carbazole derivatives reduce the chance of being oxidised to form excimers or oligomers. 3-bromo-9H-carbazole is a versatile building block that can be used to create a range of compounds, such as 9-Benzyl-3-bromo-9H-carbazole. 3-Bromo-9H-carbazole can be prepared by reacting 9H-carbzole with N-bromosuccinimide (NBS) In tetrahydrofuran at room temperature[1].
White to light yellow solid
3-Bromo-9H-carbazole is an aryl hydrocarbon receptor agonist. A standard for environmental testing and research. Substance for the bological potency study, characterization of mono to tetra-halogenated carbazoles.
3-Bromocarbazole is used as a intermediate for organic light-emitting diode(OLED) and pharmaceutical.
3-Bromocarbazole synthesis: A solution of N-bromosuccinimide (1.1g, 5.98mmol) in dimethylformamide was added dropwise to a solution of carbazole (1, 1g, 5.96mmol) in dimethylformamide (15mL) at 0°C. The reaction mixture was then stirred at room temperature for 24h. The reaction was poured into distilled water to give a cream coloured precipitate. The precipitate was filtered off under vacuum and washed with distilled water (3 × 20mL). The precipitate was dissolved in ethyl acetate, dried with sodium sulfate and filtered. Upon concentration under reduced pressure the crude product was obtained as a brown solid. After crystallisation of the crude product with chloroform, the pure 3-Bromo-9H-carbazole(692 mg, 47%) was obtained as white crystals. Rf (ethyl acetate/hexane, 1:6 v/v): 0.43; melting point: 200–201°C.
[1] Peng-Mian Huang, Xiao-Chun Wang. “9-Benzyl-3-bromo-9H-carbazole.” Acta crystallographica. Section E, Structure reports online 65 Pt 8 (2009): o1763.
