Acid yellow 40

The Uses of Acid yellow 40

To dye wool. In the isoln of polymyxin.

Definition

ChEBI: An organic sodium salt that is the monosodium salt of 5-chloro-2-[5-hydroxy-3-methyl-4-({4-[(4-methylbenzene-1-sulfonyl)oxy]phenyl}diazenyl)-1H-pyrazol-1-yl]benzene-1-sulfonic acid.

Preparation

4-Aminophenol?diazo, and 5-Chloro-2-(3-methyl-5-oxo-2H-pyrazol-1(5H)-yl)benzenesulfonic acid?coupling, and then and 4-Methylbenzene-1-sulfonyl chloride?reaction, make phenol hydroxyl esterification.

Properties and Applications

yellow. Pale yellow powder. Soluble in water, but soluble in ethylene glycol ether, slightly soluble in ethanol and acetone, insoluble in other organic solvents. The strong sulfuric acid dyes in yellow; In nitric acid in yellow. Its water solution yellow, add hydrochloric acid sodium hydroxide or no change. This product used for pure, thick wool clothing dyeing comb female?, also used for silk, polyamide fiber dyeing, wool knitting products of silk nets printing. Can also be used in leather color.