Ethylene Glycol → 2-(3-Chloropropyl)-2-phenyl-1,3-dioxolane

Beteiligte Stoffe

Reaktionsschritte

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.

Herkunft & Nachweise