反应详情

A mixture of γ-chlorobutyrophenone (33.2 g; 0.182 mol), ethylene glycol (20.3 ml; 0.363 mol), p-toluenesulfonic acid (a pinch) and toluene (300 ml) is heated at reflux for 40 hours, and the water formed in the reaction is azeotroped off. After 20 hours, more ethylene glycol (20.3 ml; 0.363 mol) is added. On completion of the reaction the mixture is extracted with saturated aqueous sodium bicarbonate solution (300 ml), the organic layer is washed with 1 N sodium hydroxide solution and then with water, and is evaporated to afford 37.0 g of a cream colored solid, m.p. 54°-55.5° C.

1. temperatureis heated
2. temperatureat reflux for 40 hours
3. customis azeotroped off
4. customOn completion of the reaction the mixture
5. extractionis extracted with saturated aqueous sodium bicarbonate solution (300 ml)
6. washthe organic layer is washed with 1 N sodium hydroxide solution
7. customwith water, and is evaporated
8. customto afford 37.0 g of a cream