2-Naphthalenesulfonic acid, 6-amino-3-[[4'-[(4-amino-6-sulfo-1-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt Usage And Synthesis

Preparation

3,3′-Dimethoxylbenzidine double nitriding, first with 8-Aminonaphthalene-2-sulfonic acid coupling, and then in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? ?coupling.

Properties and Applications

blue and black. Soluble in water for violet black, soluble in ethanol purplish red color to red sauce. In the strong sulfuric acid as dark blue, for purple diluted. The dye solution with strong hydrochloric acid as dark blue, precipitation; Add thick sodium hydroxide solution for red sauce, precipitation.

2-Naphthalenesulfonic acid, 6-amino-3-[[4'-[(4-amino-6-sulfo-1-naphthalenyl)azo]-3,3'-dimethoxy[1,1'-biphenyl]-4-yl]azo]-4-hydroxy-, disodium salt(6449-34-9)Related Product Information

• Direct black 77 (C.I. 35860)
• 5-Amino-3-[[4'-[[4-[(8-amino-1-hydroxy-3,6-disulfo-2-naphtyl)azo]-1-naphtyl]azo]-1,1'-biphenyl-4-yl]azo]-4-hydroxy-2,7-naphthalenedisulfonic acid tetrasodium salt
• DIRECT BLACK 80
• Direct Black 76
• 1,7-Naphthalenedisulfonic acid, 4-amino-6-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-5-hydroxy-, disodium salt
• DIRECT BLACK 9
• disodium 4-amino-3-[(4-aminophenyl)azo]-6-[[4-[[4-amino-6(or 7)-sulphonatonaphthyl]azo]phenyl]azo]-5-hydroxynaphthalene-1-sulphonate
• Direct black 75 (C.I. 35870)
• C.I. Direct Black 87