ChemicalBook > CAS DataBase List > 6-Amino-4-hydroxy-2-naphthalenesulfonic acid

6-Amino-4-hydroxy-2-naphthalenesulfonic acid

Product Name
6-Amino-4-hydroxy-2-naphthalenesulfonic acid
CAS No.
90-51-7
Chemical Name
6-Amino-4-hydroxy-2-naphthalenesulfonic acid
Synonyms
yacid;GAMMA ACID;c.i.developer3;Galmarine(silymarine soluble);aminonaphtholsulfonicacidgamma;7-amino-1-naphthol-3-sulfonicaci;2-AMINO-8-NAPTHOL-6-SULFONIC ACID;6-AMINO-4-NAPHTHOL-2-SULFONIC ACID;7-AMINO-1-NAPHTHOL-3-SULFONIC ACID;2-AMINO-8-NAPHTHOL-6-SULFONIC ACID
CBNumber
CB4443007
Molecular Formula
C10H9NO4S
Formula Weight
239.25
MOL File
90-51-7.mol
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6-Amino-4-hydroxy-2-naphthalenesulfonic acid Property

Boiling point:
458℃[at 101 325 Pa]
Density 
1.4338 (rough estimate)
vapor pressure 
0Pa at 25℃
refractive index 
1.6500 (estimate)
storage temp. 
Keep in dark place,Sealed in dry,Room Temperature
pka
-0.20±0.40(Predicted)
form 
powder to crystal
color 
White to Gray to Brown
Water Solubility 
4.5g/L(hot water)
InChIKey
HBZVNWNSRNTWPS-UHFFFAOYSA-N
LogP
-1.39
CAS DataBase Reference
90-51-7(CAS DataBase Reference)
EPA Substance Registry System
2-Naphthalenesulfonic acid, 6-amino-4-hydroxy- (90-51-7)
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Safety

Hazard Codes 
C
Risk Statements 
34
Safety Statements 
26-27-28-36/37/39-45
RIDADR 
UN 2585 8/PG 3
WGK Germany 
1
RTECS 
QK1295250
HS Code 
2922.21.5000
Toxicity
LD50 intraperitoneal in mouse: > 500mg/kg
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H314Causes severe skin burns and eye damage

H315Causes skin irritation

H319Causes serious eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P310Immediately call a POISON CENTER or doctor/physician.

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N-Bromosuccinimide Price

TCI Chemical
Product number
A0371
Product name
6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
Purity
>97.0%(HPLC)(T)
Packaging
25g
Price
$40
Updated
2024/03/01
TCI Chemical
Product number
A0371
Product name
6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
Purity
>97.0%(HPLC)(T)
Packaging
500g
Price
$167
Updated
2021/12/16
TRC
Product number
A611545
Product name
6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
Packaging
25g
Price
$120
Updated
2021/12/16
Biosynth Carbosynth
Product number
FA165510
Product name
2-Amino-8-naphthol-6-sulfonic acid
Packaging
250g
Price
$125
Updated
2021/12/16
AK Scientific
Product number
T958
Product name
6-Amino-4-hydroxy-2-naphthalenesulfonic Acid
Packaging
25g
Price
$67
Updated
2021/12/16
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6-Amino-4-hydroxy-2-naphthalenesulfonic acid Chemical Properties,Usage,Production

Chemical Properties

2-Amino-8-hydroxynaphthalene-6-sulfonic acid [90-51-7]. (6-amino-4-hydroxynaphthalene-2-sulfonic acid), g acid, C10H9NO4S, Mr 239.2, is obtained as white or gray crystals which are only sparingly soluble in water even at 100℃ (0.4%). The sodium salt dissolves readily in water to form solutions that exhibit a blue fluorescence. Coupling with diazo compounds is usually carried out under acid conditions and occurs in the 1-position; coupling in the 7-position can be effected in alkaline solution.

Uses

6-Amino-4-hydroxy-2-naphthalenesulfonic Acid is used in the synthesis of mono-azo dyes for application towards synthetic fibers. Also used in the synthesis of dyes with high technical properties for silk. The so-called g acid is an important component in azo dyes; coupling can be carried out under acid or alkaline conditions. The oamino azo configuration obtained under acid conditions leads to high lightfastness of special importance in monoazo acid red dyes for wool and polyamide, such as C.I. Acid Reds 37, 57, and 266.

Production Methods

2-Aminonaphthalene-6,8-disulfonic acid liquor is added over 16 h to 70 % sodium hydroxide at 190℃, while the water is allowed to evaporate to maintain the temperature. The reaction mixture is then heated for a further 6 h. Completion of the reaction is indicated by a workedup sample giving identical titers for both diazotization and coupling. The batch is diluted with water, acidified, and heated at 75℃ to expel sulfur dioxide. The product is filtered off at 55℃ and washed with warm water; yield is 84 %.
An improved process with 90 % yield is claimed by feeding concentrated 2-aminonaphthalene-6,8-disulfonic acid dipotassium salt liquor and caustic soda liquor simultaneously into the fusion reactor.

Flammability and Explosibility

Not classified

6-Amino-4-hydroxy-2-naphthalenesulfonic acid Preparation Products And Raw materials

Raw materials

2-naphthol-6,8-disulfonic acid dipotassium salt 2-Naphthylamine Sulfur dioxide Color paste Sodium hydroxide 2-Naphthol

Preparation Products

Direct Grey D disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate
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6-Amino-4-hydroxy-2-naphthalenesulfonic acid Suppliers

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View Lastest Price from 6-Amino-4-hydroxy-2-naphthalenesulfonic acid manufacturers

Hebei Zhuanglai Chemical Trading Co.,Ltd
Product
6-Amino-4-hydroxy-2-naphthalenesulfonic acid 90-51-7
Price
US $32.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
5000kg/week
Release date
2024-05-15
WUHAN FORTUNA CHEMICAL CO., LTD
Product
6-Amino-4-hydroxy-2-naphthalenesulfonic acid 90-51-7
Price
US $0.00/Kg/Drum
Min. Order
1KG
Purity
90%min
Supply Ability
1000kgs
Release date
2021-08-10
Career Henan Chemical Co
Product
6-Amino-4-hydroxy-2-naphthalenesulfonic acid 90-51-7
Price
US $1.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
500KG
Release date
2018-12-20

90-51-7, 6-Amino-4-hydroxy-2-naphthalenesulfonic acidRelated Search:

CHLOROPHOSPHONAZO III ALTRENOGEST Glycine 4-Aminobutyric acid Sulfamic acid monosodium salt Sulfanilic acid Nickel bis(sulphamidate) Citric acid Molasses 4-Amino-benzenesulfonic acid monosodium salt 2-Naphthol Ammonium sulfamate Ethyl 2-(Chlorosulfonyl)acetate Sulfamic acid Folic acid Ascoric Acid CHROMOTROPE 2B Mordant Blue 13

  • Galmarine(silymarine soluble)
  • 2-Amino-8-hydroxynaphthalene-6-sulfonic acid
  • 6-AMINO-4-HYDROXY-2-NAPHTHALENE-SULPHONICACID
  • 6-Amino-4-hydroxy-2-naphthalinsulfonsure
  • 6-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID (GAMMA ACID)
  • 2-AMINO-8-NAPTHOL-6-SULFONIC ACID
  • 1-Hydroxy-7-amino-3-naphthalenesulfonic acid
  • 4-Hydroxy-6-amino-2-naphthalenesulfonic acid
  • 6-azanyl-4-hydroxy-naphthalene-2-sulfonic acid
  • gamma Acid 2-Amino-8-naphthol-6-sulfonic Acid 7-Amino-1-naphthol-3-sulfonic Acid
  • 2-Amino-8-naphthol-6-sulfonic acid (γ acid)
  • 6-AMINO-4-NAPHTHOL-2-SULFONIC ACID
  • 6-AMINO-4-HYDROXY-2-NAPHTHALENESULFONIC ACID
  • GAMMA ACID
  • 7-AMINO-1-NAPHTHOL-3-SULFONIC ACID
  • 7-AMINO-1-HYDROXY-3-SULFONAPHTHALENE
  • 2-AMINO-8-NAPHTHOL-6-SULFONIC ACID
  • 2-Naphthalenesulfonicacid,6-amino-4-hydroxy-
  • 6-amino-4-hydroxy-2-naphthalenesulfonicaci
  • 6-Amino-4-hydroxynaphthalene-2-sulfonicacid
  • 6-Amino-4-hydroxy-2-naphthalenesulfonic acid OR 2-Amino-8-hydroxynaphthalene-6-sulfonic acid
  • 7-amino-1-naphthol-3-sulfonicaci
  • aminonaphtholsulfonicacidgamma
  • c.i.developer3
  • yacid
  • 6-amino-4-hydroxynaphthalene-2-sulphonic acid
  • 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid &gt
  • 6-Amino-4-hydroxy-2-naphthalenesulfonic acid ISO 9001：2015 REACH
  • 2-Amino-8-naphthol-6-sulfonic acid ( gamma Acid )
  • 90-51-7 6-Amino-4-hydroxy-2-naphthalenesulfonic acid
  • 6-Amino-4-hydroxynaphthalin-2-sulfonsure
  • 90-51-7
  • H2NCd0H5OHSO3H
  • C10H9O4NS
  • Organic Building Blocks
  • Sulfur Compounds
  • Sulfonic/Sulfinic Acids
  • Building Blocks
  • SULFONIC ACID
  • Building Blocks
  • Chemical Synthesis
  • Organic Building Blocks
  • Sulfonic/Sulfinic Acids
  • Sulfur Compounds
  • Intermediates
  • Organics
  • Intermediates of Dyes and Pigments