6-Amino-1-naphthalenesulfonic acid Chemical Properties

Density 

1.3588 (rough estimate)

refractive index 

1.6500 (estimate)

storage temp. 

under inert gas (nitrogen or Argon) at 2–8 °C

form 

powder to crystal

pka

-0.33±0.40(Predicted)

color 

White to Light yellow to Light red

Water Solubility 

0.33g/L(20 ºC)

Merck 

14,6407

CAS DataBase Reference

81-05-0(CAS DataBase Reference)

Safety Information

RIDADR 

1759

HazardClass 

8

PackingGroup 

III

HS Code 

29269095

MSDS

• Language:English Provider:2-Amino-5-naphthalenesulfonic acid

6-Amino-1-naphthalenesulfonic acid Usage And Synthesis

Chemical Properties

2-Aminonaphthalene-5-sulfonic acid [81-05-0]. (6-aminonaphthalene-1-sulfonic acid), Dahl’s acid, Dressel acid, D acid, C10H9NO3S, Mr 223.24, crystallizes from water as needles although only 0.4 % soluble at 100℃. The sodium, calcium, and barium salts are moderately soluble in water. Bromination in acetic acid gives the 1-bromo derivative. Sulfonation with oleum gives a mixture of 2-aminonaphthalene-5,7-disulfonic acid together with some 1,5-disulfonic acid. Fusion with potassium hydroxide at 260℃ yields 6-amino-1-naphthol.

Production Methods

Tobias acid is added to a mixture of sulfuric acid and oleum, and the reaction is completed by stirring for 12 h at 25℃. The resulting sulfonation mass, containing mainly 2-aminonaphthalene-1,5-disulfonic acid, is poured into water and heated at 105℃ for 3 h to desulfonate and precipitate the product which, after cooling, is filtered off; the yield is 95 %.

6-Amino-1-naphthalenesulfonic acid(81-05-0)Related Product Information

• Taurine
• Sulfanilic acid
• 1-Naphthylamine
• Ammonium sulfamate
• Molasses
• p-Toluenesulfonic acid
• Sulfamic acid
• 1-DODECANESULFONIC ACID SODIUM SALT
• Amlodipine Besylate
• 1-Naphthalenesulfonic acid
• Glycine
• 4-Amino-benzenesulfonic acid monosodium salt
• 2-Naphthylamine
• ALTRENOGEST
• Sulfamic acid monosodium salt
• Nickel bis(sulphamidate)
• 2-Naphthylamine-5,7-disulfonic acid
• Chlorosulfonic acid