Iodine → 4-Bromo-2-iodophenol

To a solution of 4-bromophenol (25 g, 144.5 mmol) in 25% aqueous ammonia solution (350 mL) was added a solution of potassium iodide (72 g, 433.5 mmol) and iodine (36.7 g, 144.5 mmol) in water (288 mL). The reaction mixture was stirred at ambient temperature for 2 h and quenched with 250 mL of water. The reaction was acidified by addition of concentrated HCl (350 mL) and extracted with dichloromethane. The combined organic extracts were dried over Na2SO4 and concentrated in vacuo to give the crude product which was purified by column chromatography (SiO2, 9:1 hexanes/ethyl acetate) providing 4-bromo-2-iodophenol (33 g, 77%) as a pink solid: 1H NMR (CDCl3, 300 MHz) δ 7.78-7.75 (m, 1H), 7.37-7.31 (m, 1H), 6.88 (d, J=8.7 Hz, 1H).

1. customquenched with 250 mL of water
2. additionThe reaction was acidified by addition of concentrated HCl (350 mL)
3. extractionextracted with dichloromethane
4. dry with materialThe combined organic extracts were dried over Na2SO4
5. concentrationconcentrated in vacuo
6. customto give the crude product which
7. customwas purified by column chromatography (SiO2, 9:1 hexanes/ethyl acetate)

ORD record

ord-3c0120a586f542029bd45df4fd43bf95

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09067949B2