6-amino-4-hydroxy-2-naphthalenesulfonic acid

6-amino-4-hydroxy-2-naphthalenesulfonic acid structural formula

Structural formula

Business number 022J
Molecular formula C10H9NO4S
Molecular weight 239.25

2-amino-8-naphthol-6-sulfonic acid,

7-amino-1-naphthol-3-sulfonic acid,

gamma acid,

7-amino-1-naphthol-3-sulfonic acid,


7-Amino-1-naphthol-3-sulfonic acid,


aromatic sulfur compounds

Numbering system

CAS number:90-51-7

MDL number:MFCD00003973

EINECS number:202-000-8

RTECS number:QK1295250

BRN number:1821283

PubChem number:24846150

Physical property data

1. Properties: White needle-like crystals.

2. Density (g/mL, 25/4℃): Undetermined

3. Relative vapor density (g/mL, air=1): Undetermined

4. Melting point (ºC): Not determined

5. Boiling point (ºC, normal pressure): Not determined

6. Boiling point (ºC, 5.2kPa): Not determined Determined

7. Refractive index: Undetermined

8. Flash point (ºC): Undetermined

9. Specific rotation (º): Undetermined

10. Autoignition point or ignition temperature (ºC): Undetermined

11. Vapor pressure (kPa, 25ºC): Undetermined

12. Saturation Vapor pressure (kPa, 60ºC): Undetermined

13. Heat of combustion (KJ/mol): Undetermined

14. Critical temperature (ºC): Undetermined

15. Critical pressure (KPa): Undetermined

16. Log value of oil-water (octanol/water) partition coefficient: Undetermined

17. Explosion upper limit (% , V/V): Undetermined

18. Lower explosion limit (%, V/V): Undetermined

19. Solubility: Soluble in ethanol and ether, slightly soluble in water. It turns gray purple when encountering ferric chloride. Corrosive.

Toxicological data


Ecological data


Molecular structure data

1. Molar refractive index: 59.80

2. Molar volume (cm3/mol): 147.0

3. Isotonic specific volume (90.2K ): 448.3

4. Surface tension (dyne/cm): 86.4

5. Polarizability (10-24cm3): 23.70

Compute chemical data

1. Hydrophobic parameter calculation reference value (XlogP): -0.9

2. �Number of �� bond donors: 3

3. Number of hydrogen bond acceptors: 5

4. Number of rotatable chemical bonds: 1

5. Interconversion Number of isomers: 3

6. Topological molecular polar surface area (TPSA): 101

7. Number of heavy atoms: 16

8. Surface charge : 0

9. Complexity: 350

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. The number of uncertain atomic stereocenters: 0

13. The number of determined chemical bond stereocenters: 0

14. The number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 1

Properties and stability

The alkaline solution has blue fluorescence and can be oxidized in the air.

Poisonous. Toxic and highly corrosive raw materials are used in production. Operators should wear labor protection equipment and strengthen ventilation in the workshop.

Storage method

This product should be sealed and stored away from light.

Packaged in iron drums lined with plastic bags, with a net weight of 50kg per bag. It should be stored in a dry and ventilated warehouse to prevent heat and sunlight.

Synthesis method

Alkaline fusion of 2-naphthol-6,8-disulfonic acid dipotassium salt (G salt) with sodium hydroxide to obtain 2,8-di Hydroxy-6-naphthalene sulfonate. After acidification and ammoniation, gamma acid ammonium salt is obtained, and then acid precipitation with sulfuric acid is used to obtain the finished product.


Dye intermediates. Mainly used to prepare direct diazo black BH, direct dark brown M, direct dark brown NM, direct maroon GB, direct red F, direct gray D, direct purple N, direct gray AC, direct light fast gray B, etc., as well as active Dyes and acid dyes, acid red BG, etc. ​​

BDMAEE:Bis (2-Dimethylaminoethyl) Ether

CAS NO:3033-62-3

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