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

6-Amino-4-hydroxy-2-naphthalenesulfonic acid Structure
6-Amino-4-hydroxy-2-naphthalenesulfonic acid structure
CAS No.
90-51-7
Chemical Name:
6-Amino-4-hydroxy-2-naphthalenesulfonic acid
Synonyms
GAMMA ACID;2-AMINO-8-NAPHTHOL-6-SULFONIC ACID;yacid;c.i.developer3;Galmarine(silymarine soluble);aminonaphtholsulfonicacidgamma;7-amino-1-naphthol-3-sulfonicaci;2-Amino-8-phthol-6-sulfonic acid;2-AMINO-8-NAPTHOL-6-SULFONIC ACID;6-AMINO-4-NAPHTHOL-2-SULFONIC ACID
CBNumber:
CB4443007
Molecular Formula:
C10H9NO4S
Molecular Weight:
239.25
MDL Number:
MFCD00003973
MOL File:
90-51-7.mol
MSDS File:
SDS
Last updated:2026-05-28 03:18:05
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6-Amino-4-hydroxy-2-naphthalenesulfonic acid Properties

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)
InChI InChI=1S/C10H9NO4S/c11-7-2-1-6-3-8(16(13,14)15)5-10(12)9(6)4-7/h1-5,12H,11H2,(H,13,14,15)
InChIKey HBZVNWNSRNTWPS-UHFFFAOYSA-N
SMILES C1=C2C(C=C(N)C=C2)=C(O)C=C1S(O)(=O)=O
LogP -1.39
CAS DataBase Reference 90-51-7(CAS DataBase Reference)
FDA UNII 0PLB93P56X
EPA Substance Registry System 2-Naphthalenesulfonic acid, 6-amino-4-hydroxy- (90-51-7)
UNSPSC Code 12352100

SAFETY

Risk and Safety Statements

Symbol(GHS)  Corrosion (GHS05)Exclamation Mark (GHS07)
GHS05,GHS07
Signal word  Danger
Hazard statements  H315-H319-H314
Precautionary statements  P280-P305+P351+P338-P310-P264-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313
PPE Eyeshields, Faceshields, Gloves, type P3 (EN 143) respirator cartridges
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
TSCA  TSCA listed
HS Code  2922.21.5000
Storage Class 8A - Combustible corrosive hazardous materials
Hazard Classifications Eye Dam. 1
Skin Corr. 1B
Toxicity LD50 intraperitoneal in mouse: > 500mg/kg
REACH Registrations Active
NFPA 704
0
3 0

6-Amino-4-hydroxy-2-naphthalenesulfonic acid price More Price(21)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
TCI Chemical A0371 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid >97.0%(HPLC)(T) 90-51-7 25g $36 2026-04-30 Buy
TCI Chemical A0371 6-Amino-4-hydroxy-2-naphthalenesulfonic Acid >97.0%(HPLC)(T) 90-51-7 500g $167 2021-12-16 Buy
aablocks AA00IFVA 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 97%(HPLC)(T)(contains<10%H2O) 90-51-7 25g $15 2026-05-29 Buy
aablocks AA00IFVA 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 97%(HPLC)(T)(contains<10%H2O) 90-51-7 100g $25 2026-05-29 Buy
aablocks AA00IFVA 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 97%(HPLC)(T)(contains<10%H2O) 90-51-7 500g $41 2026-05-29 Buy
Product number Packaging Price Buy
A0371 25g $36 Buy
A0371 500g $167 Buy
AA00IFVA 25g $15 Buy
AA00IFVA 100g $25 Buy
AA00IFVA 500g $41 Buy

6-Amino-4-hydroxy-2-naphthalenesulfonic acid Chemical Properties,Uses,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

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Preparation Products

Direct Grey D disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate 4-Amino-6-[[4'-[(7-amino-1-hydroxy-3-sulfo-2-naphtyl)azo]-1,1'-biphenyl-4-yl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt C.I. Direct Black 151 Direct Grey D
Acid Red 440 Direct Black 197 CHLORAZOL BLACK BH 5-[[2,4-Diamino-5-[(8-hydroxy-6-sodiosulfo-2-naphthalenyl)azo]phenyl]azo]-4-hydroxy-3-[[4'-[(4-hydroxyphenyl)azo][1,1'-biphenyl]-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt 3-Amino-4-[[4'-[(2-amino-8-hydroxy-6-sodiosulfo-1-naphthalenyl)azo]-1,1'-biphenyl-4-yl]azo]naphthalene-2,7-disulfonic acid disodium salt
DIRECT BLACK 22 C.I. Direct Brown 166 2-Naphthalenesulfonic acid, 6-[[4-amino-6(or 7)-sulfo-1-naphthalenyl]azo]-3-[[4-[(2,4-diaminophenyl)azo]phenyl]azo]-4-hydroxy-, disodium salt Glycine, N-[5-amino-4-[2-[4-[2-[[2-(2,4-diamino-5-methylphenyl)diazenyl]hydroxysulfo-2-naphthalenyl]diazenyl]phenyl]diazenyl]-2-methylphenyl]-, sodium salt (1:2) ACID RED 266
disodium 6-amino-5-[(4-amino-2-sulphonatophenyl)azo]-4-hydroxynaphthalene-2-sulphonate

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

Global( 381)Suppliers
Supplier Tel Email Country ProdList Advantage
Hubei Zhonglong Kangsheng Fine Chemical Co., Ltd. 027-83855385 13407122916 13037171113@163.com China 998 58
J & K SCIENTIFIC LTD. 18210857532 18210857532 jkinfo@jkchemical.com China 96815 76
TCI (Shanghai) Development Co., Ltd. 021-67121386 Sales-CN@TCIchemicals.com China 24512 81
Shanghai Hanhong Scientific Co.,Ltd. 021-54306202 13764082696 info@hanhongsci.com China 42917 64
Shandong Xiya Chemical Co., Ltd 13355009207 13355009207 3007715519@qq.com China 18722 57
Sichuan Kulinan Technology Co., Ltd 400-1166-196 18981987031 cdhxsj@163.com China 11674 57
RYSS TECH LTD 400-188-0725 +86 21 34310725 13611771617 China 1999 57
Tianjin heowns Biochemical Technology Co., Ltd. 400 638 7771 sales@heowns.com China 14412 57
Maya High Purity Chemicals +86 (573) 82222445 (0)18006601000 452520369 sales@maya-r.com China 11693 57
BioBioPha Co., Ltd. 0871-65217109 y.liu@mail.biobiopha.com China 5641 65
Supplier Advantage
Hubei Zhonglong Kangsheng Fine Chemical Co., Ltd. 58
J & K SCIENTIFIC LTD. 76
TCI (Shanghai) Development Co., Ltd. 81
Shanghai Hanhong Scientific Co.,Ltd. 64
Shandong Xiya Chemical Co., Ltd 57
Sichuan Kulinan Technology Co., Ltd 57
RYSS TECH LTD 57
Tianjin heowns Biochemical Technology Co., Ltd. 57
Maya High Purity Chemicals 57
BioBioPha Co., Ltd. 65

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

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
6-Amino-4-hydroxy-2-naphthalenesulfonic acid pictures 2026-09-11 6-Amino-4-hydroxy-2-naphthalenesulfonic acid
90-51-7
 1KG 90%min 1000kgs WUHAN FORTUNA CHEMICAL CO., LTD
6-Amino-4-hydroxy-2-naphthalenesulfonic acid pictures 2026-08-25 6-Amino-4-hydroxy-2-naphthalenesulfonic acid
90-51-7
 $3.00-9.00 99% ZHENGZHOU JIUYI TIME NEW MATERIALS CO,.LTD
6-Amino-4-hydroxy-2-naphthalenesulfonic acid pictures 2026-08-20 6-Amino-4-hydroxy-2-naphthalenesulfonic acid
90-51-7
 $1.10 1g 99.00% 100 Tons Min Dideu Industries Group Limited

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

6-Amino-4-hydroxy-2-naphthalenesulfonic acid(90-51-7)1HNMR6-Amino-4-hydroxy-2-naphthalenesulfonic acid(90-51-7)IR16-Amino-4-hydroxy-2-naphthalenesulfonic acid(90-51-7)IR2

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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 7-AMINO-1-NAPHTHOL-3-SULFONIC ACID 7-AMINO-1-HYDROXY-3-SULFONAPHTHALENE 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 > 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 2-Amino-8-phthol-6-sulfonic acid γ acid 6-Amino-4-hydroxy-2-naphthalenesulfonic acid 2-AMINO 8 NAPHTHOL 6 SULPHONIC ACID 2-AMINO-8-NAPHTHOL-6-SULFONIC ACID GAMMA ACID 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