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2-Aminonaphthalene-1-sulfonic acid

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Company Name: Hebei Mojin Biotechnology Co., Ltd
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Products Intro: Product Name:2-Aminonaphthalene-1-sulfonic acid
CAS:81-16-3
Purity:99% Package:25KG
Company Name: Shanghai Daken Advanced Materials Co.,Ltd
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Products Intro: Product Name:2-Aminonaphthalene-1-sulfonic acid
CAS:81-16-3
Purity:99% Package:100g ;1KG ;5KG 25KG
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Products Intro: Product Name:2-Aminonaphthalene-1-sulfonic acid
CAS:81-16-3
Purity:99% Package:1kg;1USD
Company Name: NINGBO INNO PHARMCHEM CO., LTD.
Tel: 13867897135
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Products Intro: Product Name:2-Naphtylamine-1-Sulfonic Acid
CAS:81-16-3
Company Name: Hubei Jusheng Technology Co.,Ltd.
Tel: 18871490254
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Products Intro: Product Name:2-Naphthylamine-1-Sulfonic Acid
CAS:81-16-3
Purity:99% Package:5KG;1KG Remarks:C10H9NO3S

2-Aminonaphthalene-1-sulfonic acid manufacturers

2-Aminonaphthalene-1-sulfonic acid Basic information
Product Name:2-Aminonaphthalene-1-sulfonic acid
Synonyms: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-
CAS:81-16-3
MF:C10H9NO3S
MW:223.25
EINECS:201-331-5
Product Categories:Organics;Intermediates;Intermediates of Dyes and Pigments
Mol File:81-16-3.mol
2-Aminonaphthalene-1-sulfonic acid Structure
2-Aminonaphthalene-1-sulfonic acid Chemical Properties
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
pkapK1: 2.35 (25°C)
color White to Off-White
Water Solubility 4.083g/L(20 ºC)
Merck 14,6406
BRN 613084
CAS DataBase Reference81-16-3(CAS DataBase Reference)
NIST Chemistry Reference2-Naphthylamine-1-sulfonic acid(81-16-3)
EPA Substance Registry System2-Amino-1-naphthalenesulfonic acid (81-16-3)
Safety Information
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 Data81-16-3(Hazardous Substances Data)
MSDS Information
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2-Naphthylamine-1-sulfonic acid English
SigmaAldrich English
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2-Aminonaphthalene-1-sulfonic acid Usage And Synthesis
Chemical PropertiesGrey 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.
UsesAzo 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.
Uses2-Amino-1-naphthalenesulfonic acid has been used in the preparation of 2-(2-naphthylamino)benzoxazole by reacting with 2-chlorobenzoxazole.
Production Methods2-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 Description2-Amino-1-naphthalenesulfonic acid is a manufacturing intermediate in the monosulfo monoazo color additive D&C Red No. 34 and its lakes.
Purification MethodsCrystallise 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.]
Tag:2-Aminonaphthalene-1-sulfonic acid(81-16-3) Related Product Information
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)