Реакция #1797507

Уравнение реакции

Water

3-Bromophenol

sodium nitrate

water

→

title compound

Выход 20.0%

5-bromo-2-nitrophenol

Выход 20.0%

Растворители

sulfuric acid

Условия реакции

Обработка

1. 1
   Экстракцияthe resulting mixture was extracted with diethyl ether
2. 2
   Сушкаthe extract was dried (MgSO4)
3. 3
   Фильтрацияfiltered
4. 4
   Концентрированиеconcentrated
5. 5
   ДругоеThe residue was purified by flash chromatography (silica gel, 10% ethyl acetate/hexanes)

Методика

3-Bromophenol (32.9 g, 0.19 mol) was added slowly to a cold (10° C.) solution of sodium nitrate (29.0 g, 0.34 mol) in conc. sulfuric acid; (40.0 g) and water (70.0 mL) and the resulting mixture was allowed to stir at room temperature for 2 h. Water (200 mL) was added and the resulting mixture was extracted with diethyl ether and the extract was dried (MgSO4), filtered and concentrated. The residue was purified by flash chromatography (silica gel, 10% ethyl acetate/hexanes) to afford first the title compound (8.1 g, 20%), mp 40-42° C., then the undesired isomer, 3-bromo-4-nitrophenol, as a yellow solid (12.7 g, 31%). mp 125-127° C.

Источник