ChemicalBook > CAS DataBase List > 2-Naphthol-6,8-disulfonic acid

2-Naphthol-6,8-disulfonic acid

Product Name
2-Naphthol-6,8-disulfonic acid
CAS No.
118-32-1
Chemical Name
2-Naphthol-6,8-disulfonic acid
Synonyms
-Naphthol-disulphonicacid;β-Naphtholdisulfonic acid;2-NAPHTHOL-6,8-DISULFONIC ACID;NAPHTHOL-6,8-DIPOTASSIUMDISUFONATE;7-hydroxy-3-naphthalenedisulfonicacid;7-hydroxynaphthalene-1,3-disulfonicaci;7-Hydroxy-1,3-naphthalenedisulfonicacid;2-Hydroxynaphthalene-6,8-disulfonicacid;7-hydroxynaphthalene-1,3-disulfonic acid;7-hydroxynaphthalene-1,3-disulphonicacid
CBNumber
CB6838933
Molecular Formula
C10H8O7S2
Formula Weight
304.3
MOL File
118-32-1.mol
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2-Naphthol-6,8-disulfonic acid Property

Boiling point:
415.13°C (rough estimate)
Density 
1.7421 (rough estimate)
refractive index 
1.6000 (estimate)
form 
solid
pka
-0.33±0.40(Predicted)
color 
Off-white
EPA Substance Registry System
1,3-Naphthalenedisulfonic acid, 7-hydroxy- (118-32-1)
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Safety

HS Code 
2904100090
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

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

P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.

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N-Bromosuccinimide Price

Arctom
Product number
AS028882
Product name
7-Hydroxynaphthalene-1,3-disulfonicacid
Purity
96%
Packaging
250mg
Price
$24
Updated
2021/12/16
Arctom
Product number
AS028882
Product name
7-Hydroxynaphthalene-1,3-disulfonicacid
Purity
96%
Packaging
1g
Price
$58
Updated
2021/12/16
Arctom
Product number
AS028882
Product name
7-Hydroxynaphthalene-1,3-disulfonicacid
Purity
96%
Packaging
5g
Price
$161
Updated
2021/12/16
Chemenu
Product number
CM140985
Product name
7-hydroxynaphthalene-1,3-disulfonicacid
Purity
97%
Packaging
100g
Price
$704
Updated
2021/12/16
Crysdot
Product number
CD44000712
Product name
7-Hydroxynaphthalene-1,3-disulfonicacid
Purity
97%
Packaging
100g
Price
$753
Updated
2021/12/16
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2-Naphthol-6,8-disulfonic acid Chemical Properties,Usage,Production

Chemical Properties

2-Hydroxynaphthalene-6,8-disulfonic acid [118-32-1]. (7-hydroxynaphthalene-1,3- disulfonic acid), G acid, C10H8O7S2, Mr 304.3: most salts of 55 are more readily soluble in water than those of R acid, with the notable exception of the potassium salt. Sulfonation with 20 % oleum at 100℃ yields 2-hydroxynaphthalene3,6,8-trisulfonic acid. Diazo coupling takes place in the 1-position, although the reaction is sluggish, as in the case of 2-hydroxynaphthalene8-sulfonic acid.

Uses

The G acid is aminated (Bucherer reaction) to give 2-aminonaphthalene-6,8- disulfonic acid and subjected to caustic fusion at 200℃ to yield 2,8-dihydroxynaphthalene-6-sulfonic acid (a precursor of g acid). It is also used as a coupling component for a wide range of azo colorants, e.g., C.I. Acid Orange 10, C.I. Acid Red 187, and C.I. Food Red 7.

Production Methods

2-Naphthol is added to 98 % sulfuric acid at 40℃. Then, 20 % oleum is added over 6 h and the temperature is allowed to rise to 60℃. The reaction is completed by heating for a further 16 h at 60℃ followed by 15 h at 80℃. After the reaction mixture has been poured into water, potassium chloride is added to the hot solution and the batch is cooled slowly to 35℃ before filtering off the crystalline dipotassium salt of G acid and carefully washing out any residual R salt; the yield is 60 %. In addition, R salt can be recovered from the filtrate in 12 % yield after conversion to its sodium salt.

2-Naphthol-6,8-disulfonic acid Preparation Products And Raw materials

Raw materials

FUMING SULFURIC ACID NAPHTHENIC ACID Sulfuric acid

Preparation Products

Disodium 2-naphthol-3,6-disulfonate
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118-32-1, 2-Naphthol-6,8-disulfonic acidRelated Search:

PALATINE CHROME GREEN Acid Red 18 disodium 7-hydroxy-8-[[4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]naphthalene-1,3-disulphonate 2-Naphthol-6,8-disulfonic acid PONCEAU 6R DIRECT FAST RED 3B disodium 8-[[3,3'-dimethoxy-4'-[[4-[[(p-tolyl)sulphonyl]oxy]phenyl]azo][1,1'-biphenyl]-4-yl]azo]-7-hydroxynaphthalene-1,3-disulphonate 2-NAPHTHOL-6,8-DISULFONIC ACID DIPOTASSIUM SALT 7-hydroxy-1,3-naphthalenesulfonic acid, potassium salt ACID RED 114 DIRECT SCARLET B Acid Red 73 CRYSTAL PONCEAU 6R 1-PHENYLAZO-2-NAPHTHOL-6,8-DISULFONIC ACID DISODIUM SALT 1-NAPHTHOL-3,8-DISULFONIC ACID DISODIUM SALT 6-Amino-1-naphthol-3,5-disulfonic acid,3-amino-8-naphthol-4,6-disulfonic acid,2-amino-5-naphthol-1,7-disulfonic acid 1-PHENYLAZO-2-NAPHTHOL-6,8-DISULFONIC ACID DISODIUM SALT 1-NAPHTHOL-3,8-DISULFONIC ACID

  • 7-Hydroxy-1,3-naphthalenedisulfonicacid
  • 7-hydroxynaphthalene-1,3-disulfonic acid hydrate
  • 7-hydroxy-3-naphthalenedisulfonicacid
  • 7-hydroxynaphthalene-1,3-disulphonicacid
  • -Naphthol-disulphonicacid
  • 2-NAPHTHOL-6,8-DISULFONIC ACID
  • 7-hydroxynaphthalene-1,3-disulfonic acid
  • 2-Hydroxynaphthalene-6,8-disulfonicacid
  • NAPHTHOL-6,8-DIPOTASSIUMDISUFONATE
  • β-Naphtholdisulfonic acid
  • 1,3-Naphthalenedisulfonicacid, 7-hydroxy-
  • 2-NAPHTHOL-6 8-DISULFONIC ACID ( G SALT )
  • TIANFUCHEM--High purity 118-32-1 2-Naphthol-6,8-disulfonic acid
  • 7-hydroxynaphthalene-1,3-disulfonicaci
  • 118-32-1
  • C10H6O7S2K2
  • Intermediates of Dyes and Pigments