反应详情

A solution of ethyl 3,4-bis(2-methoxyethoxy)benzoate (23.23 g, 77.87 mmol) in acetic acid (80 mL) was added dropwise to concentrated nitric acid (21 mL) cooled with an ice bath at such a rate as to keep the internal temperature below 5° C. After 30 min, the solution was allowed to warm to room temperature and stirred for 48 h. The solution was poured onto iced water (400 mL) and extracted with ethyl acetate (3×100 mL). The organic phases were combined and washed cautiously with saturated aqueous sodium bicarbonate (3×200 mL) and brine (2×100 mL). The organic phase was dried (Na2SO4) and concentrated to give the title compound as a solid (24.82 g, 93%).

1. temperaturecooled with an ice bath at such a rate as
2. customthe internal temperature below 5° C
3. extractionextracted with ethyl acetate (3×100 mL)
4. washwashed cautiously with saturated aqueous sodium bicarbonate (3×200 mL) and brine (2×100 mL)
5. dry with materialThe organic phase was dried (Na2SO4)
6. concentrationconcentrated