反应详情

A mixture of 2-bromo-5-methoxy-benzaldehyde (45.25 g), ethylene glycol (52.22 g) and 4-toluenesulphonic acid (0.4 g) in toluene (400 mL) is heated at reflux for 5 hours using a Dean and Stark apparatus to remove water formed in the reaction. The reaction mixture is washed five times with water (500 mL) and evaporated giving 2-(2-bromo-5-methoxyphenyl)-[1,3]dioxolane (51.9 g) as a yellow liquid.

1. temperatureis heated
2. temperatureat reflux for 5 hours
3. customto remove water
4. customformed in the reaction
5. washThe reaction mixture is washed five times with water (500 mL)
6. customevaporated