7-Amino-1,3-naphthalenedisulfonic acid Chemical Properties

Melting point:

300°C

Density 

1.6329 (rough estimate)

refractive index 

1.7330 (estimate)

pka

-0.93±0.40(Predicted)

form 

Powder or Needles

color 

Off-white to beige-green to light brown

Water Solubility 

soluble

CAS DataBase Reference

86-65-7(CAS DataBase Reference)

EPA Substance Registry System

1,3-Naphthalenedisulfonic acid, 7-amino- (86-65-7)

Safety Information

Hazard Codes 

C

Risk Statements 

34

Safety Statements 

26-28A

RIDADR 

1759

HazardClass 

8

PackingGroup 

III

HS Code 

29214900

MSDS

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7-Amino-1,3-naphthalenedisulfonic acid Usage And Synthesis

Chemical Properties

off-white to beige-green to light brown. 2-Aminonaphthalene-6,8-disulfonic acid [86-65-7]. (7-aminonaphthalene-1,3-disulfonic acid), amino G acid, C10H9NO6S2, Mr 303.3, and its bis-alkali-metal salts are very soluble in water, but the acid salts, especially the acid potassium salt, are much less soluble.

Uses

Azo dye intermediate.

Uses

7-Amino-1,3-naphthalenedisulfonic Acid is a reagent which may be used in the preparation of pyrimidine derivatives.

Production Methods

The disodium or dipotassium salt of 2-hydroxynaphthalene-6,8-disulfonic acid is heated with excess aqueous ammonia and ammonium bisulfite at 185℃ for 18 h. The reaction mixture is basified, heated to remove excess ammonia, neutralized, and evaporated while any residual sulfite is removed. The resulting amino G acid liquor (95 % yield) is used directly for caustic fusion to give g acid, the major outlet.

Safety Profile

Questionable carcinogen with experimental neoplastigenic data. When heated to decomposition it emits toxic fumes of NOx and SOx.

7-Amino-1,3-naphthalenedisulfonic acid(86-65-7)Related Product Information

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