反应详情

A mixture of 2-bromo-5-hydroxybenzaldehyde (60.0 g, 299 mmol), ethylene glycol (56 mL, 1.00 mol), and p-toluenesulfonic acid (1.14 g, 5.98 mmol) in toluene (450 mL) was refluxed with Dean-Stark head for overnight. Potassium carbonate (3 g) was added, and the mixture was extracted with ethyl acetate. The organic layer was washed with brine and dried on anhydrous sodium sulfate. The solvent was removed under reduced pressure to give 4-bromo-3-(1,3-dioxolan-2-yl)phenol (66.1 g, 90%).

1. temperaturewas refluxed with Dean-Stark head for overnight
2. extractionthe mixture was extracted with ethyl acetate
3. washThe organic layer was washed with brine
4. dry with materialdried on anhydrous sodium sulfate
5. customThe solvent was removed under reduced pressure