申请人:American Hoechst Corporation
公开号:US04379937A1
公开(公告)日:1983-04-12
An improved process for selectively N-acylating hydroxy-amino-arylsulfonic acids is disclosed wherein the hydroxy-amino-arylsulfonic acid is dissolved in water by treatment with an alkaline lithium salt, such as lithium hydroxide, and the acylation is conducted while maintaining the pH at about 3-6. The N-acyl-hydroxy-amino-arylsulfonic acids are useful as dyestuff precursors.
本发明公开了一种改进的选择性N-酰化羟基-氨基-芳基磺酸的工艺,其中通过使用碱性锂盐(例如氢氧化锂)处理使羟基-氨基-芳基磺酸在水中溶解,并在保持pH在约3-6的条件下进行酰化。所得到的N-酰基-羟基-氨基-芳基磺酸可用作染料前体。