Water → 4-Iodo-2,6-dimethoxyphenol

Temperature

60 °C

To a solution of 50.0 g of (0.170 mmol) of 1-iodo-3,4,5-trimethoxybenzene in methylene chloride (500 mL) was added 24.96 g (0.187 mmol) of aluminum chloride. The mixture was stirred at 60° C. for 6 hours. After cooling in an ice bath, ice (200 mL) and water (300 mL) were added and the resulting mixture was stirred. The reaction mixture was filtered through Celite and the aqueous layer of the filtrate was extracted with chloroform. The organic layers were combined, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was purified by chromatography on silica gel to yield crude crystals. The crude crystals were recrystallized from toluene-hexane, whereby 33.17 g of 4-hydroxy-l-iodo-3,5-dimethoxybenzene was obtained as a colorless crystalline powder (mp: 73.0 to 75.0° C., yield: 70%).

1. temperatureAfter cooling in an ice bath
2. stirringthe resulting mixture was stirred
3. filtrationThe reaction mixture was filtered through Celite
4. extractionthe aqueous layer of the filtrate was extracted with chloroform
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by chromatography on silica gel
8. customto yield crude crystals
9. customThe crude crystals were recrystallized from toluene-hexane

ORD record

ord-29e7bbea1d0c4ed1bb3cb55b735f5262

Source dataset

uspto-grants-2004_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06787653B2