Reacción #1797507

Ecuación de reacción

Water

3-Bromophenol

sodium nitrate

water

→

title compound

Rendimiento 20.0%

5-bromo-2-nitrophenol

Rendimiento 20.0%

Disolventes

sulfuric acid

Condiciones de reacción

Tratamiento posterior

1. 1
   Extracciónthe resulting mixture was extracted with diethyl ether
2. 2
   Secadothe extract was dried (MgSO4)
3. 3
   Filtraciónfiltered
4. 4
   Concentraciónconcentrated
5. 5
   OtroThe residue was purified by flash chromatography (silica gel, 10% ethyl acetate/hexanes)

Procedimiento

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.

Fuente