反应详情

4.8 g of product obtained in stage A is heated to reflux for 3 hours with 4.8 g of sodium acetate in 48 cm3 of acetic anhydride. The mixture is cooled to room temperature and evaporated to dryness, the residue is taken up in 50 cm3 of water, filtered off and dried and 3.7 g of expected crude product are obtained. M.p. 165°-170° C. After crystallization in ethanol, 2.9 g of pure product are obtained. M.p. 169°-171° C.

1. customevaporated to dryness
2. filtrationfiltered off
3. customdried