ChemicalBook > CAS DataBase List > Naphthalene-2,7-disulfonic acid

Naphthalene-2,7-disulfonic acid

Product Name
Naphthalene-2,7-disulfonic acid
CAS No.
92-41-1
Chemical Name
Naphthalene-2,7-disulfonic acid
Synonyms
Ebert-Merz α-acid;naphthalene-2,7-disulfonicaci;3,6-Naphthalenedisulfonic acid;2,7-NAPHTHALENE DISULFONIC ACID;naphthalene-2,7-disulfonic acid;naphthalene-2,7-disulphonic acid
CBNumber
CB5297140
Molecular Formula
C10H8O6S2
Formula Weight
288.3
MOL File
92-41-1.mol
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Naphthalene-2,7-disulfonic acid Property

Melting point:
199°C
Boiling point:
400.53°C (rough estimate)
Density 
1.6867 (rough estimate)
refractive index 
1.6950 (estimate)
storage temp. 
2-8°C
pka
-0.33±0.40(Predicted)
CAS DataBase Reference
92-41-1(CAS DataBase Reference)
EPA Substance Registry System
2,7-Naphthalenedisulfonic acid (92-41-1)
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Safety

RIDADR 
1759
HazardClass 
8
PackingGroup 
III
HS Code 
2904100090
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Danger
Hazard statements

H314Causes severe skin burns and eye damage

Precautionary statements

P260Do not breathe dust/fume/gas/mist/vapours/spray.

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

P310Immediately call a POISON CENTER or doctor/physician.

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N-Bromosuccinimide Price

Matrix Scientific
Product number
098990
Product name
Naphthalene-2,7-disulfonic acid
Purity
95+%
Packaging
250mg
Price
$341
Updated
2021/12/16
AK Scientific
Product number
5613AC
Product name
Naphthalene-2,7-disulfonicacid
Packaging
250mg
Price
$510
Updated
2021/12/16
Matrix Scientific
Product number
098990
Product name
Naphthalene-2,7-disulfonic acid
Purity
95+%
Packaging
1g
Price
$756
Updated
2021/12/16
American Custom Chemicals Corporation
Product number
DYE0002087
Product name
2,7-NAPHTHALENE DISULFONIC ACID
Purity
98.00%
Packaging
10G
Price
$1715.18
Updated
2021/12/16
American Custom Chemicals Corporation
Product number
DYE0002087
Product name
2,7-NAPHTHALENE DISULFONIC ACID
Purity
98.00%
Packaging
500G
Price
$4519.52
Updated
2021/12/16
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Naphthalene-2,7-disulfonic acid Chemical Properties,Usage,Production

Chemical Properties

White, crystalline solid.Soluble in water. Combustible. Naphthalene-2,7-disulfonic acid [92- 41-1]. C10H8O6S2, Mr 288.28; the sodium salt of Naphthalene-2,7-disulfonic acid is much more soluble than that of the 2,6- isomer but can be isolated and purified by precipitation of the calcium salt at lower temperature followed by recrystallization.

Uses

Intermediate for dyes. The disodium salt of 8 gives 2-hydroxynaphthalene-7-sulfonic acid or 2,7-dihydroxynaphthalene by fusion processes. Sulfonation by oleum gives the 1,3,6-trisulfonic acid, and nitration gives 1-nitronaphthalene-3,6- disulfonic acid. In sulfuric acid solution, the disodium salt of naphthalene-2,7-disulfonic acid undergoes an unusual reaction at the 4-position with 4,40 -bis- (dimethylamino)benzhydrol. The resulting condensation product is oxidized with lead dioxide to give the acid basic dye C.I. Acid Green 16.

Production Methods

The 2,7-disulfonic acid is always the main product of high-temperature sulfonation of naphthalene, but at 160 C it converts slowly to an equilibrium mixture containing ca. 30 % of the 2,6-isomer. Crystallization of the pure product from conventional sulfonation is difficult, and alternative processes, (for example, reaction of naphthalene vapor with sulfur trioxide in the gas phase at 220 C) are said to give a purer product.

Definition

ChEBI: A naphthalenesulfonic acid in which the sulfo groups are attached to positions 2 and 7 of the naphthalene ring.

Purification Methods

Crystallise the acid from conc HCl. The disulfonamide has m 273o (from EtOH). [Beilstein 11 II 119, 11 III 463.]

Naphthalene-2,7-disulfonic acid Preparation Products And Raw materials

Raw materials

Preparation Products

ERIO GREEN B 1,8-Dihydroxynaphthylene-3,6-disulfonic acid
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View Lastest Price from Naphthalene-2,7-disulfonic acid manufacturers

Shaanxi Dideu Medichem Co. Ltd
Product
Naphthalene-2,7-disulfonic acid 92-41-1
Price
US $0.00-0.00/KG
Min. Order
1KG
Purity
99.0%
Supply Ability
1000KG
Release date
2024-08-08
Career Henan Chemical Co
Product
Naphthalene-2,7-disulfonic acid 92-41-1
Price
US $1.00/ASSAYS
Min. Order
1ASSAYS
Purity
99%
Supply Ability
100KG
Release date
2020-01-07

92-41-1, Naphthalene-2,7-disulfonic acidRelated Search:

Naphthalene Naphthalene-2-sulfonic acid Sodium 1-naphthalenesulfonate Sodium xylenesulfonate ACID RED 26 CHROMOTROPE 2B 1-(2-ARSONOPHENYLAZO)-2-HYDROXY-3,6-NAPHTHALENE-DISULFONIC ACID SODIUM SALT OCTAHYDRATE ARSENAZO I ACID RED 1 CHROMOTROPE 2R 1,5-NAPHTHALENE DISULFONIC ACID DISUDIUM SALT,1,5-NAPHTHALENE DISULFONIC ACID SODIUM SALT SPADNS ACID VIOLET 5 ACID VIOLET 7 1-NITROSO-2-NAPHTHOL-3,6-DISULFONIC ACID DISODIUM SALT Mordant Blue 13 ARSENAZO III DISODIUM SALT 3-Hydroxy-4-[[4-(phenylazo)phenyl]azo]naphthalene-2,7-disulfonic acid disodium salt

  • naphthalene-2,7-disulfonic acid
  • 2,7-NAPHTHALENE DISULFONIC ACID
  • naphthalene-2,7-disulphonic acid
  • 3,6-Naphthalenedisulfonic acid
  • Ebert-Merz α-acid
  • naphthalene-2,7-disulfonicaci
  • 92-41-1
  • 91-41-1
  • C10H8S2O6
  • Intermediates of Dyes and Pigments
  • bc0001