反应详情

A mixture of 2-(4-chloro-2-formyl-phenoxy)-pentanoic acid ethyl ester (15 g, 53 mmol), ethylene glycol (25 mL, 440 mmol) and p-toluenesulfonic acid (0.8 g, 4.65 mmol) in toluene (150 mL) was refluxed with a Dean-Stark trap attached to remove water. After 3 h, the reaction was cooled and washed with water, saturated NaHCO3 solution and water, dried over anhydrous Na2SO4 and concentrated to give the title compound as a light yellow oil (16 g).

1. temperaturewas refluxed with a Dean-Stark trap
2. customto remove water
3. temperaturethe reaction was cooled
4. washwashed with water, saturated NaHCO3 solution and water
5. dry with materialdried over anhydrous Na2SO4
6. concentrationconcentrated