反应详情

A mixture of 3,4-dichlorostyrylsulfonamide (12.6 g., 0.05 mole) and 3,4-dimethoxybenzoyl chloride (11.0 g., 0.055 mole) in 15 ml. of phosphorus oxychloride is heated at steam bath temperature for a period of 30 min. Excess phosphorus oxychloride is removed under reduced pressure and dry benzene added. The benzene is evaporated and the treatment repeated two times. Benzene (50 ml.) is added to the residue thus obtained and the insoluble solid collected providing 14.6 g. (70% yield) of N-(3,4-dichlorostyrylsulfonyl)-3,4-dimethoxybenzamide, m.p. 145°-147° C.

1. customExcess phosphorus oxychloride is removed under reduced pressure and dry benzene
2. additionadded
3. customThe benzene is evaporated
4. additionBenzene (50 ml.) is added to the residue
5. customthus obtained
6. customthe insoluble solid collected
7. customproviding 14.6 g