68030-71-7Relevant academic research and scientific papers
Concentrated, aqueous solutions of salts of acetoacetylamino-arylsulphonic acids and method of forming concentrated solutions of azo dyestuffs therefrom
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, (2008/06/13)
Salts of acetoacetylamino-arylsulphonic acids, of the formula STR1 wherein R denotes an optionally substituted benzene or naphthalene nucleus, Me denotes a protonated, tertiary, hydrophilizing nitrogen base or the lithium cation and m denotes 1,2 or 3 are easily obtained by reacting compounds of the formula wherein R and m have the above mentioned meaning, with diketene in an aqueous or aqueous-organic solvent maintaining a pH>3 during the reaction by adding tertiary, hydrophilizing nitrogen bases or a basic lithium salt. The salts can be obtained as concentrated solutions which are easily reacted with diazotized aromatic amines to concentrated solutions of azo dyestuffs.
