Potassium Iodide → 1,4-Dibromo-2-iodobenzene

Temperature

65 °C

To a stirred mixture of 2.50 g (9.96 mmol) 2,5-dibromoaniline in 7 mL conc. sulfuric acid and 20 mL water, was added a solution of 1.00 g (14.5 mmol) sodium nitrite in 10 mL water dropwise at 0° C. and the mixture was stirred at this temperature for 1.25 h. A solution of 2.15 g (13.0 mmol) potassium iodide in 20 mL water was added dropwise under ice cooling. The ice bath was removed and the reaction mixture was heated to 65° C. for 30 min. After cooling to RT, the mixture was worked up by adding aqueous sodium thiosulfate solution, followed by extraction with PE/EtOAc. The combined organic phases were washed with aqueous sodium thiosulfate solution and saturated aqueous sodium bicarbonate solution, dried over sodium sulfate, filtered and concentrated in vacuo. The crude material was purified by flash chromatography (PE/EtOAc=100→96/4).

1. customThe ice bath was removed
2. temperatureAfter cooling to RT
3. additionby adding aqueous sodium thiosulfate solution
4. extractionfollowed by extraction with PE/EtOAc
5. washThe combined organic phases were washed with aqueous sodium thiosulfate solution and saturated aqueous sodium bicarbonate solution
6. dry with materialdried over sodium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customThe crude material was purified by flash chromatography (PE/EtOAc=100→96/4)

ORD record

ord-3155c25404674101834ddd64735195ac

Source dataset

uspto-grants-2014_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08883789B2