5-Amino-1-naphthalenesulfonic acid Chemical Properties

Melting point:

>300°C

Boiling point:

220°C (rough estimate)

Density 

1.3588 (rough estimate)

refractive index 

1.6500 (estimate)

solubility 

Aqueous Base (Slightly), DMSO (Slightly)

pka

pK1: 3.69 (25°C)

form 

powder to crystal

color 

Purple to Dark purple to Dark red

Water Solubility 

Soluble in hot water.

Merck 

14,6404

BRN 

2214149

CAS DataBase Reference

84-89-9(CAS DataBase Reference)

EPA Substance Registry System

1-Naphthalenesulfonic acid, 5-amino- (84-89-9)

Safety Information

Hazard Codes 

C

Risk Statements 

20/21/22-34

Safety Statements 

26-36/37/39-45

RIDADR 

UN 2585 8/PG 3

WGK Germany 

3

RTECS 

QK1270500

TSCA 

Yes

HS Code 

2921.45.2000

HazardClass 

8

PackingGroup 

III

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

5-Amino-1-naphthalenesulfonic acid Usage And Synthesis

Chemical Properties

?1-Aminonaphthalene-5-sulfonic acid [84- 89-9]. (5-aminonaphthalene-1-sulfonic acid), Laurent’s acid, L acid, Purpurin acid, C10H9NO3S, Mr 223.24, crystallizes from hot water as needles of the monohydrate. The alkalimetal salts are all readily soluble in water. Bromination yields the 2,4-dibromo derivative, vigorous nitration gives 2,4-dinitro-1- hydroxynaphthalene, and sulfonation results in 1-aminonaphthalene-2,5,7-trisulfonic acid. 1- Hydroxynaphthalene-5-sulfonic acid is obtained by heating 104 with aqueous bisulfite (reverseBucherer reaction) or via the diazo compound. Caustic fusion produces 5-amino-1-hydroxynaphthalene. Coupling with diazo compounds takes place in the 2-position.

Uses

Intermediate of dyestuff

Uses

5-Aminonaphthalene-1-sulfonic acid is an deriva- tizing agents in the precolumn derivatization of some chiral phenoxy acid. Cu(II) based on a dansyl derivative was synthesized with 29.2% overall yield by a seven-step synthetic procedure from the readily available starting material 5-aminonaphthalene-1-sulfonic acid.

Definition

ChEBI: 5-Amino-1-naphthalenesulfonic acid is a naphthalenesulfonic acid.

Production Methods

Laurent’s acid is coproduced with Peri acid as the minor component of a 5:2 isolated product ratio.

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 IV 2800.]

5-Amino-1-naphthalenesulfonic acid(84-89-9)Related Product Information

• 1-DODECANESULFONIC ACID SODIUM SALT
• 4-Amino-benzenesulfonic acid monosodium salt
• Molasses
• Sulfamic acid
• Ethyl 2-(Chlorosulfonyl)acetate
• ALTRENOGEST
• Sulfamic acid monosodium salt
• Ammonium sulfamate
• Sulfanilic acid
• p-Toluenesulfonic acid
• Glycine
• 1-Naphthalenesulfonic acid
• 1-Naphthylamine
• Naphthalene-2-sulfonic acid
• Taurine
• Benzenesulfonic acid
• Nickel bis(sulphamidate)
• Chlorosulfonic acid