Preparation
2-Amino-5-(4-amino-3-barboxyphenyl)benzoic acid double nitriding, first with 3-Methyl-1-phenyl-1H-pyrazol-5(4H)-one coupling, and then and 3,5-Dihydroxy-7-sulfo-2-naphthoic acid?coupling.
Properties and Applications
black light brown. Soluble in water for purplish red, slightly soluble in alcohol. The strong sulfuric acid for violet black, diluted is shallow brown. The dye solution to join strong hydrochloric acid for chocolate brown, have precipitation; Add thick sodium hydroxide solution for dark brown.
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Standard
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Acid Resistance
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Alkali Resistance
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Light Fastness
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Soaping
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Water
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Fading
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Stain
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Fading
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Stain
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AATCC
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2
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3-4
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6-7
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4
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4
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![[1,1'-Biphenyl]-3,3'-dicarboxylic acid, 4-[(6-carboxy-1,7-dihydroxy-3-sulfo-2-naphthalenyl)azo]-4'-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-, tetrasodium salt Structure](https://www.chemicalbook.com/CAS/20200331/GIF/6470-19-5.gif)