反应详情

3-Bromothiophen-2-aldehyde (2) (7.44 g, 39 mmol), ethylene glycol (2.7 ml, 48 mmol), anhydrous benzene (130 ml) and a few crystals of p-toluenesulphonic acid were refluxed in a Dean-Stark apparatus until no more water separated. The benzene layer was washed with a solution of bicarbonate, dried (Na2SO4), and evaporated under reduced pressure to give the derivative 3 (6.8 g, 28.9 mmol, 74% yield) as an oil.

1. customseparated
2. washThe benzene layer was washed with a solution of bicarbonate
3. dry with materialdried (Na2SO4)
4. customevaporated under reduced pressure