Product

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid

CAS No.：90-20-0

Other grades of this product :

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Basic information

Product Name:	1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid
Synonyms:	4-amino-5-hydroxy-7-naphthalenedisulfonicacid;7-Naphthalenedisulfonicacid,4-amino-5-hydroxy-2;c.i.35570;1-Naphthol-8-amino-3,6-disulfonicacid;kyselina1-amino-8-naftol-3,6-disulfonova;1-AMINO-8-NAPHTHOL-3,6-DISULFONIC ACID;4-AMINO-5-HYDROXY-2,7-NAPTHALENEDISULFONIC ACID;4-AMINO-5-HYDROXY-2,7-NAPHTHALENEDISULFONIC ACID
CAS:	90-20-0
MF:	C10H9NO7S2
MW:	319.31
EINECS:	201-975-7
Product Categories:	Intermediates of Dyes and Pigments;OLED materials,pharm chemical,electronic
Mol File:	90-20-0.mol

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Chemical Properties

Melting point	>300 °C(lit.)
density	1.6832 (rough estimate)
refractive index	1.7640 (estimate)
pka	-0.95±0.40(Predicted)
CAS DataBase Reference	90-20-0(CAS DataBase Reference)
EPA Substance Registry System	2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- (90-20-0)

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38
Safety Statements	26-36
WGK Germany	3
HS Code	2922210060

MSDS Information

Provider	Language
1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid	English
SigmaAldrich	English

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Usage And Synthesis

Uses

4-Amino-5-hydroxy-2,7-naphthalenedisulfonic Acid is useful for preparing reactive dyes.

Purification Methods

A slightly alkaline solution of Na2CO3 (ca 22g) in water (litmus) is added to a solution of 100g of the dry acid in 750mL of hot distilled water, followed by 5g of activated charcoal and 5g of Celite. The suspension is stirred for 10minutes and filtered by suction. The acid is then precipitated by adding ca 40mL of conc HCl (solution is blue to Congo Red), then filter it by suction through a shark skin filter circular sheet (or hardened filter paper) and wash it with 100mL of distilled water. The purification process is repeated. The acid is dried overnight in an oven at 60o and stored in a dark bottle The diethylamine salt has m 306-307o(dec, from aqueous EtOH). [Post & Moore Anal Chem 31 1872 1959]. [Beilstein 14 H 840, 14 I 758, 14 II 502, 14 III 2292, 14 IV 2824.]

1-Amino-8-hydroxynaphthalene-3,6-disulphonic acid Preparation Products And Raw materials

Raw materials	4,5-diaminonaphthalene-2,7-disulfonic acid-->Koch acid-->Naphthalene-2,7-disulfonic acid
Preparation Products	2-Aminonaphthalene-1-sulfonic acid

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