2-Amino-4,8-naphthalenedisulfonic acid
2-Amino-4,8-naphthalenedisulfonic acid Basic information
- Product Name:
- 2-Amino-4,8-naphthalenedisulfonic acid
- Synonyms:
-
- 2-Ethylamino-4,8-dinaphthalene
- 5-Naphthalenedisulfonicacid,3-amino-1
- acidiv
- beta-naphthylamine-4,8-disulfonicacid
- beta-naphthylaminedisulfonicacid
- kyselina2-naftylamin-4,8-disulfonova
- kyselinac
- 2-Ethylamino-4,8-dinaphthalenedisulfonicacid
- CAS:
- 131-27-1
- MF:
- C10H9NO6S2
- MW:
- 303.31
- EINECS:
- 205-020-5
- Product Categories:
-
- Intermediates of Dyes and Pigments
- Mol File:
- 131-27-1.mol
2-Amino-4,8-naphthalenedisulfonic acid Chemical Properties
- Boiling point:
- 205.8°C (rough estimate)
- Density
- 1.6329 (rough estimate)
- refractive index
- 1.7330 (estimate)
- storage temp.
- 2-8°C
- pka
- -1.16±0.40(Predicted)
- CAS DataBase Reference
- 131-27-1(CAS DataBase Reference)
- EPA Substance Registry System
- 1,5-Naphthalenedisulfonic acid, 3-amino- (131-27-1)
Safety Information
- Risk Statements
- 36/37/38
- Safety Statements
- 26-36/37/39
- Toxicity
- rat,LD50,oral,11400mg/kg (11400mg/kg),"Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1058, 1986.
2-Amino-4,8-naphthalenedisulfonic acid Usage And Synthesis
Chemical Properties
2-Aminonaphthalene-4,8-disulfonic acid [131-27-1]. (3-aminonaphthalene-1,5-disulfonic acid), Cassella acid, C acid, C10H9NO6S2, Mr 303.32, and its salts are readily soluble in water. Reduction with sodium amalgam desulfonates 2-Aminonaphthalene-4,8-disulfonic acid to give 2-aminonaphthalene-8-sulfonic acid, whereas boiling with dilute sulfuric acid results in desulfonation and hydrolysis to give 2- hydroxynaphthalene-4-sulfonic acid. Alkali fusion (KOH, 215℃) produces 2-amino-4-hydroxynaphthalene-8-sulfonic acid.
Uses
2-Amino-4,8-naphthalenedisulfonic Acid is used in green preparation method of direct blended blue D 3GL.
Uses
Cassella acid is an important diazo component for yellow direct and reactive dyes.
Production Methods
The iron(II) salt of 3-nitronaphthalene-1,5-disulfonic acid (nitro-Armstrong acid) is reduced with iron in dilute acid. A claimed improvement involves isolation of nitro-Armstrong acid from the nitration products of naphthalene-1,5-disulfonic acid as the crystalline magnesium salt prior to catalytic reduction to C acid.
2-Amino-4,8-naphthalenedisulfonic acid Preparation Products And Raw materials
Preparation Products
Raw materials
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