2-Hydroxy-3-[(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-5-sulfobenzoic acid trisodium salt Chemical Properties,Usage,Production
Preparation
3-Amino-2-hydroxy-5-sulfobenzoic acid diazotization, and 4-Hydroxynaphthalene-1-sulfonic acid coupling.
Properties and Applications
brilliant red light purple. Moderate soluble in water (in red) and ethanol (orange). In concentrated sulfuric acid for product red, orange for after diluted. Dye aqueous solution to join concentrated hydrochloric acid for nacarat, Join concentrated sodium hydroxide solution for orange.
![2-Hydroxy-3-[(1-hydroxy-4-sulfo-2-naphthalenyl)azo]-5-sulfobenzoic acid trisodium salt Structure](https://www.chemicalbook.com/CAS/GIF/5858-43-5.gif)