反应详情

To a 0° C. solution of 3-chloro-4-methoxy aniline (1.0 g; 6.4 mmol) in 1:1 H2O:conc. H2SO4 (100 mL) was added very slowly a solution of NaNO2 (0.5 g; 7.6 mmol) in H2O (10 mL). Thick yellow fumes were emitted, and the black solution was then heated to reflux for 30 min. The mixture was extracted with EtOAc (4×50 mL) and the combined extracts were concentrated in vacuo. The residue was chromatographed (SiO2; 4:1 hex:EtOAc) to obtain 3-chloro-4-methoxy phenol (300 mg; 30%) as a yellow oil.

1. customTo a 0° C.
2. temperaturethe black solution was then heated
3. temperatureto reflux for 30 min
4. extractionThe mixture was extracted with EtOAc (4×50 mL)
5. concentrationthe combined extracts were concentrated in vacuo
6. customThe residue was chromatographed (SiO2; 4:1 hex:EtOAc)