反应详情

A suspension of 1 (5.66 g, 24.3 mmol) in aqueous NaOH (2% w/v, 81 ml) was stirred at room temperature for 16 hours. The mixture was acidified with 3N HCl to pH 1, the precipitate was collected by filtration, washed with water and dried under vacuum, affording 6 (4.88 g, 90%) as light brown solid.

1. filtrationthe precipitate was collected by filtration
2. washwashed with water
3. customdried under vacuum