Selective acylation of hydroxy-amino-arylsulfonic acids

Details Selective acylation of hydroxy-amino-arylsulfonic acids Selective acylation of hydroxy-amino-arylsulfonic acids

C - Chemistry, Metallurgy

07

D

260/287, 260/291

C07D 215/38 (2006.01) C07C 309/51 (2006.01) C07D 213/75 (2006.01)

Patent

CA 1208222

ABSTRACT 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.

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