反应详情

17.6 g of potassium 4-(4-hydroxy-3-carbomethoxy-phenylazo)-benzenesulphonate, 30 ml of benzene, 2 ml of dimethylformamid and 6 ml of thionyl chloride are heated to the boiling point under reflux for 30 min. The mixture is cooled, and cold water and 100 ml of petroleum ether are added with rapid stirring. The product is filtered off and washed with water and dried, whereupon 15.4 g of the title compound are obtained. The melting point is 137° - 138° C. after recrystallization.

1. temperatureunder reflux for 30 min
2. temperatureThe mixture is cooled
3. filtrationThe product is filtered off
4. washwashed with water
5. dry with materialdried, whereupon 15.4 g of the title compound
6. customare obtained
7. customThe melting point is 137° - 138° C. after recrystallization