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2-Amino-4,8-naphthalenedisulfonic acid

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CAS:131-27-1
Purity:99% Package:25KG;5KG;1KG

2-Amino-4,8-naphthalenedisulfonic acid manufacturers

2-Amino-4,8-naphthalenedisulfonic acid Basic information
Product Name:2-Amino-4,8-naphthalenedisulfonic acid
Synonyms:2-Ethylamino-4,8-dinaphthalenedisulfonicacid;3-amino-1,5-naphthalenedisulfonic;3-amino-5-naphthalenedisulfonicacid;3-aminonaphthalene-1,5-disulphonicacid;4,8-disulfo-2-naphthalamine;CASSELLA ACID;C ACID;2-NAPHTHYLAMINE-4,8-DISULFONIC ACID
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 Structure
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)
InChIInChI=1S/C10H9NO6S2/c11-6-4-8-7(10(5-6)19(15,16)17)2-1-3-9(8)18(12,13)14/h1-5H,11H2,(H,12,13,14)(H,15,16,17)
InChIKeyMTJGVAJYTOXFJH-UHFFFAOYSA-N
SMILESC1(S(O)(=O)=O)=C2C(C(S(O)(=O)=O)=CC=C2)=CC(N)=C1
CAS DataBase Reference131-27-1(CAS DataBase Reference)
EPA Substance Registry System1,5-Naphthalenedisulfonic acid, 3-amino- (131-27-1)
Safety Information
Risk Statements 36/37/38
Safety Statements 26-36/37/39
Toxicityrat,LD50,oral,11400mg/kg (11400mg/kg),"Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1058, 1986.
MSDS Information
2-Amino-4,8-naphthalenedisulfonic acid Usage And Synthesis
Chemical Properties2-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.
Uses2-Amino-4,8-naphthalenedisulfonic Acid is used in green preparation method of direct blended blue D 3GL.
UsesCassella acid is an important diazo component for yellow direct and reactive dyes.
Production MethodsThe 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.
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