2-Naphthol-3,6-disulfonic acid disodium salt

2-naphthol-3,6-disulfonic acid disodium salt structural formula

2-naphthol-3,6-disulfonic acid disodium salt structural formula

Structural formula

Business number 03Q6
Molecular formula C10H6Na2O7S2
Molecular weight 348.26

3-Hydroxy-2,7-naphthalenedisulfonic acid disodium salt,

RG acid,

R acid sodium salt,

R salt,

Disodium 2-naphthol-3,6-disulfonate,

3-Hydroxy-2,7-naphthalenedisulfonic acid,

R acid,

2-Naphthol-3,6-disulfonic acid disodium salt,

Disodium 3-hydroxy-2,7-naphthalenedisulfonate,

R-Acid sodium salt,

fluorescent indicator,

Aromatic amine reagents

Numbering system

CAS number:135-51-3

MDL number:MFCD00065915

EINECS number:205-196-3

RTECS number:QJ6477000

BRN number:3643184

PubChem number:24886100

Physical property data

1. Properties: Colorless and shiny filamentous needle-like crystals, the industrial product is gray-white paste.

2. Solubility: soluble in water, ethanol and ether, insoluble in benzene. The aqueous solution has blue-green fluorescence.

Toxicological data

Reproduction data

Oral TDLo: 2mg/kg in female rats from 1 to 20 days after pregnancy;

Ecological data


Molecular structure data


Compute chemical data

1. Reference value for hydrophobic parameter calculation (XlogP): None

2. Number of hydrogen bond donors: 1

3. Number of hydrogen bond acceptors: 7

4. Number of rotatable chemical bonds: 0

5. Number of tautomers: 3

6. Topological molecule polar surface area 151

7. Number of heavy atoms: 21

8. Surface charge: 0

9. Complexity: 501

10. Number of isotope atoms: 0

11. Determine the number of atomic stereocenters: 0

12. Uncertain number of atomic stereocenters: 0

13. Determine the number of chemical bond stereocenters: 0

14. Number of uncertain chemical bond stereocenters: 0

15. Number of covalent bond units: 3

Properties and stability

Storage method

Store sealed in a cool, dry place.

Synthesis method

When G salt is prepared by sulfonation and salting out of 2-naphthol, part of R acid is also produced as a by-product. The waste acid after separation of G salt is salted out with sodium chloride to obtain R salt. First add saturated sodium chloride solution to the salting out kettle, preheat to 30°C, then add the R acid solution after sulfonation of 2-naphthol, salting out, and separation of G salt, stir for 1 to 2 minutes, let it stand, and use Suction filter. Then wash with saturated sodium chloride solution 3 to 4 times and blot dry to obtain the finished product R salt.


Fluorescent indicator. Diazonium salt��Aromatic amine reagents. Organic Synthesis.

Dye intermediates. Mainly used to prepare azo dyes, food pigments, etc.

BDMAEE:Bis (2-Dimethylaminoethyl) Ether

CAS NO:3033-62-3

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