2-naphthol-3,6-disulfonic acid disodium salt
structural formula
| business number | 03q6 |
|---|---|
| molecular formula | c10h6na2o7s2 |
| molecular weight | 348.26 |
| label |
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
none
molecular structure data
none
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.
purpose
fluorescent indicator. diazonium salt��aromatic amine reagents. organic synthesis.
dye intermediates. mainly used to prepare azo dyes, food pigments, etc.