反应详情

A vigorously stirred solution of 5-tert-butyl-salicyclic acid (3.88 g) in carbon disulphide (80 ml) was treated portionwise with anhydrous aluminium chloride (8.8 g). The mixture was brought cautiously to the reflux temperature and treated with acetyl chloride (3.45 g) dropwise during 15 minutes. The mixture was heated at reflux with vigorous stirring for 20 hours and then the mixture was added to a mixture of chloroform (80 ml), ice (100 g) and concentrated hydrochloric acid (20 ml), and stirred for a further one hour. The organic layer was then separated, washed with water (3 × 20 ml), and dried over anhydrous sodium sulphate, and the solvent was removed in vacuo. The resulting solid was recrystallized from ethyl acetate, to give 3-acetyl-5-tert-butylsalicylic acid (2.3 g), m.p. 159°-161° C.

1. temperatureThe mixture was heated
2. temperatureat reflux
3. stirringstirred for a further one hour
4. customThe organic layer was then separated
5. washwashed with water (3 × 20 ml)
6. dry with materialdried over anhydrous sodium sulphate
7. customthe solvent was removed in vacuo
8. customThe resulting solid was recrystallized from ethyl acetate