ChemicalBook > CAS DataBase List > 2-Aminonaphthalene-1-sulfonic acid

2-Aminonaphthalene-1-sulfonic acid

Product Name
2-Aminonaphthalene-1-sulfonic acid
CAS No.
81-16-3
Chemical Name
2-Aminonaphthalene-1-sulfonic acid
Synonyms
Nsc5523;TOBIAS ACI;TOBIAS ACID;TOBIAC ACID;SUPER J ACID;Tobiasacid,98%;Wln: L66J bswq cz;kyselinatobiasova;TOBIAS ACID 97 PCT;Kyselina tobiasova
CBNumber
CB1128987
Molecular Formula
C10H9NO3S
Formula Weight
223.25
MOL File
81-16-3.mol
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2-Aminonaphthalene-1-sulfonic acid Property

Melting point:
180 °C
Boiling point:
220°C (rough estimate)
Density 
1.3588 (rough estimate)
refractive index 
1.5250 (estimate)
storage temp. 
-20°C Freezer, Under inert atmosphere
solubility 
DMSO (Slightly), Methanol (Slightly, Heated), Water (Slightly, Heated)
form 
Solid
pka
pK1: 2.35 (25°C)
color 
White to Off-White
Water Solubility 
4.083g/L(20 ºC)
Merck 
14,6406
BRN 
613084
CAS DataBase Reference
81-16-3(CAS DataBase Reference)
NIST Chemistry Reference
2-Naphthylamine-1-sulfonic acid(81-16-3)
EPA Substance Registry System
2-Amino-1-naphthalenesulfonic acid (81-16-3)
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Safety

Risk Statements 
36/37/38-40
Safety Statements 
26-36/37/39
RIDADR 
2585
WGK Germany 
1
RTECS 
QK1250000
TSCA 
Yes
HS Code 
2921.45.9010
HazardClass 
8
PackingGroup 
III
Hazardous Substances Data
81-16-3(Hazardous Substances Data)
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Hazard and Precautionary Statements (GHS)

Symbol(GHS)
Signal word
Warning
Hazard statements

H319Causes serious eye irritation

H320Causes eye irritation

Precautionary statements

P264Wash hands thoroughly after handling.

P264Wash skin thouroughly after handling.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P337+P313IF eye irritation persists: Get medical advice/attention.

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N-Bromosuccinimide Price

TCI Chemical
Product number
A0343
Product name
2-Amino-1-naphthalenesulfonic Acid
Purity
>98.0%(HPLC)(T)
Packaging
25g
Price
$48
Updated
2024/03/01
TCI Chemical
Product number
A0343
Product name
2-Amino-1-naphthalenesulfonic Acid
Purity
>98.0%(HPLC)(T)
Packaging
500g
Price
$408
Updated
2024/03/01
Alfa Aesar
Product number
A18644
Product name
2-Aminonaphthalene-1-sulfonic acid, 98%
Packaging
500g
Price
$70.4
Updated
2024/03/01
Alfa Aesar
Product number
A18644
Product name
2-Aminonaphthalene-1-sulfonic acid, 98%
Packaging
2500g
Price
$239
Updated
2023/06/20
TRC
Product number
A618330
Product name
2-Amino-1-naphthalenesulfonic Acid
Packaging
250g
Price
$120
Updated
2021/12/16
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2-Aminonaphthalene-1-sulfonic acid Chemical Properties,Usage,Production

Chemical Properties

Grey white to light pink powder. 2-Aminonaphthalene-1-sulfonic acid [81-16-3].  Tobias acid, C10H9NO3S, Mr 223.24, is sparingly soluble in water but the sodium salt is readily soluble. Coupling with diazo compounds takes place in the 1-position with elimination of the sulfonic acid group.

Uses

Azo dye intermediate, optical brighteners. Sulfonation with oleum gives 2-aminonaphthalene-1,5-disulfonic acid, which can be desulfonated to produce 2-aminonaphthalene-5- sulfonic acid. Tobias acid is used as a diazo component in acid dyes (e.g., C.I. Acid Yellow 19), red reactive dyes, and pigments such as the important Lithol Reds, [e.g., C.I. Pigment Red 49]. The free acid of C.I. Pigment Red 49 is also remarkably insoluble and can be used as a pigment.

Uses

2-Amino-1-naphthalenesulfonic acid has been used in the preparation of 2-(2-naphthylamino)benzoxazole by reacting with 2-chlorobenzoxazole.

Production Methods

2-Hydroxynaphthalene-1-sulfonic acid is heated with a mixture of ammonia and ammonium sulfite in an autoclave at 150 ℃ and 1 MPa for 30 h. The reaction mixture is added to a slurry of lime, and excess ammonia is driven off. Inorganic calcium salts are filtered off at 80℃, and the filtrate is acidified with hydrochloric acid at 40℃ to precipitate Tobias acid in 95 % yield. Care must be taken throughout the process to avoid desulfonation and formation of 2- naphthylamine.

General Description

2-Amino-1-naphthalenesulfonic acid is a manufacturing intermediate in the monosulfo monoazo color additive D&C Red No. 34 and its lakes.

Purification Methods

Crystallise the acid under nitrogen from boiling water and dry it in a steam oven [Bryson Trans Faraday Soc 47 522, 527 1951]. [Beilstein 14 III 2240, 14 IV 2792.]

2-Aminonaphthalene-1-sulfonic acid Preparation Products And Raw materials

Raw materials

Sulfur dioxide 2-Ethylnitrobenzene Chlorosulfonic acid Hydrochloric acid Sodium hydroxide Sodium sulfonate 2-Naphthol Sulfuric acid Ammonia

Preparation Products

2-Amino-1,5-naphthalenedisulfonic acid Lithol Red disodium 2-[[1-(2,5-dichloro-4-sulphonatophenyl)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-4-yl]azo]naphthalene-1-sulphonate REACTIVE RED 195 sodium 2-[(2-hydroxynaphthyl)azo]naphthalenesulphonate J acid 3-Hydroxy-N-2-naphthyl-2-naphthamide ReactivebrilliantredKE-7B
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View Lastest Price from 2-Aminonaphthalene-1-sulfonic acid manufacturers

Hebei Duling International Trade Co. LTD
Product
2-Aminonaphthalene-1-sulfonic acid 81-16-3
Price
US $6.00/kg
Min. Order
1kg
Purity
99%
Supply Ability
20 tons
Release date
2023-03-17
Hebei Mojin Biotechnology Co., Ltd
Product
2-Aminonaphthalene-1-sulfonic acid 81-16-3
Price
US $0.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
50000KG/month
Release date
2023-08-16
Hebei Guanlang Biotechnology Co,.LTD
Product
2-Aminonaphthalene-1-sulfonic acid 81-16-3
Price
US $5.00-2.00/KG
Min. Order
1KG
Purity
99%
Supply Ability
10000kg
Release date
2023-03-28

81-16-3, 2-Aminonaphthalene-1-sulfonic acidRelated Search:

1-Naphthylamine Taurine Amlodipine Besylate Ethyl 2-(Chlorosulfonyl)acetate p-Toluenesulfonic acid Sulfanilic acid Ammonium sulfamate Sulfamic acid Molasses 4-Amino-benzenesulfonic acid monosodium salt 1-DODECANESULFONIC ACID SODIUM SALT 1,5-Naphthalenedisulfonic acid 2-Naphthylamine Glycine Folic acid 1-Naphthalenesulfonic acid Sulfamic acid monosodium salt Nickel bis(sulphamidate)

  • SUPER J ACID
  • 2 NAPHTHYLAMINE SULPHONIC ACID
  • 2-NAPHTHYLAMINE-1-SULFONIC ACID
  • 2-AMINO-1-NAPHTHALENESULFONIC ACID
  • 2-AMINONAPHTHALENE-1-SULFONIC ACID
  • TOBIAS ACID
  • 1-Naphthalenesulfonic acid, 2-amino-
  • 1-Naphthalenesulfonicacid,2-amino-
  • 2-amino-1-naphthalenesulfonic
  • 2-amino-1-naphthalenesulfonicaci
  • 2-aminonaphthalene-1-sulphonic acid
  • TOBIAS ACID 97 PCT
  • TOBIAS ACI
  • TOBIAC ACID
  • BETA-NAPHTHYLAMINE-1-SULFONIC ACID
  • 2-amino-aphthalene-sulfonic acid
  • Tobiasacid,98%
  • 2-AMINO-1-NAPHTHALENESULPHONICACID
  • 2-Naphthylamin-1-sulfonsure
  • 2-NAPHTHYLAMINE-1-SULFONIC ACID (TOBIAS ACID)
  • 2-Aminonaphthalin-1-sulfonsaure
  • 1-Sulfo-2-naphthylamine
  • Naphthalenesulfonic acid, 2-amino-
  • Nsc5523
  • Wln: L66J bswq cz
  • 2-amino-1-naphthalenesulfonate
  • Tobias acid:2-Naphthylamine-1-sulfonic acid:Tobias acid
  • 2-Naphtylamine-1-Sulfonic Acid
  • 2-Amino-1-naphthalenesulfonic acid≥ 99% (Assay)
  • Kyselina 2-naftylamin-1-sulfonova
  • Kyselina tobiasova
  • kyselina2-naftylamin-1-sulfonova
  • kyselina2-naftylamin-1-sulfonova(czech)
  • kyselinatobiasova
  • kyselinatobiasova(czech)
  • NaphthylaMine-1-sulfonic
  • 2-Amino-1-naphthalenesulfonic Acid &gt
  • 2-Naphthylamine-1-SulfonicAci
  • 2-Aminonaphthalene-1-sulfonic acid ISO 9001：2015 REACH
  • 2-Amino-1-naphthalenesulfonic Acid, ≥ 98.0%
  • 81-16-3
  • C10H8NO3S
  • Building Blocks
  • Organic Building Blocks
  • Sulfur Compounds
  • Sulfonic/Sulfinic Acids
  • Organics
  • Intermediates
  • Intermediates of Dyes and Pigments