反应详情

A solution of (b) (2.0 g, 6.3 mmol), 1M aqueous sodium hydroxide solution (1.2 ml, 1.2 mmol) in ethanol (40 ml) was stirred at room temperature for 3 hours. After concentration, the residue was diluted with water and acidified with a saturated solution of potassium hydrogenosulfate to pH 5. The precipitated solid was filtered, washed with water and dried under vacuum to afford a foam (1.0 g, 54%).

1. concentrationAfter concentration
2. additionthe residue was diluted with water
3. filtrationThe precipitated solid was filtered
4. washwashed with water
5. customdried under vacuum