反应详情

3 g of the product of Example A are refluxed for 1.5 hours in a mixture of 40 ml of glacial acetic acid, 2 ml of water and 0.6 ml of concentrated sulphuric acid. The reaction mixture is then treated with 40 ml of water and cooled to room temperature. The product is filtered off with suction, washed with water and dried. 2.08 g of the title compound are obtained (75% of theory).

1. filtrationThe product is filtered off with suction
2. washwashed with water
3. customdried