81-16-3 Usage
Description
2-Aminonaphthalene-1-sulfonic acid is an organic compound that serves as a manufacturing intermediate and chemical building block in various industrial applications. It is characterized by its grey white to light pink powder form and is known for its role in the synthesis of dyes and other chemical compounds.
Uses
Used in Azo Dye Industry:
2-Aminonaphthalene-1-sulfonic acid is used as an azo dye intermediate for the production of various colored compounds. Its chemical structure allows it to react with other molecules to form azo dyes, which are widely used in coloring fabrics, plastics, and other materials.
Used in Optical Brighteners Industry:
2-Aminonaphthalene-1-sulfonic acid is also utilized as a key component in the creation of optical brighteners. Optical brighteners are additives that enhance the appearance of materials by reflecting light more effectively, making them appear brighter and more vivid.
Used in Pharmaceutical Industry:
2-Aminonaphthalene-1-sulfonic acid is used as a reagent in the synthesis of 2-(2-naphthylamino)benzoxazole, which is obtained by reacting it with 2-chlorobenzoxazole. This synthesized compound has potential applications in the pharmaceutical industry, possibly for the development of new drugs or drug intermediates.
Used in Cosmetic Industry:
As a manufacturing intermediate, 2-Aminonaphthalene-1-sulfonic acid contributes to the production of monosulfo monoazo color additive D&C Red No. 34 and its lakes. These color additives are used in cosmetics to provide vibrant shades and enhance the visual appeal of various products.
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.]
Check Digit Verification of cas no
The CAS Registry Mumber 81-16-3 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 8 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 81-16:
(4*8)+(3*1)+(2*1)+(1*6)=43
43 % 10 = 3
So 81-16-3 is a valid CAS Registry Number.
InChI:InChI=1/C10H9NO3S/c11-9-6-5-7-3-1-2-4-8(7)10(9)15(12,13)14/h1-6H,11H2,(H,12,13,14)/p-1
81-16-3Relevant articles and documents
Fibre reactive azo dyestuffs
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, (2008/06/13)
Fiber reactive azo dyestuffs of the formula STR1 in which R=H or C1 -C6 alkyl, which can be substituted with OH, Hal, SO3 H or OSO3 H; Z=heterocyclic five or six membered ring; n, m=0, 1 or 2, wherein n+m=0, 1 or 2; Y=OH, OR, NR2 R3, OMe; and R2, R3, =H, R and R2, R3 and N can form a heterocyclic 5 or 6-membered ring.
Reactive dye having both monochlorotriazinyl and vinylsulfone type reactive groups
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, (2008/06/13)
A novel reactive monoazo dye, capable of giving cellulose fiber materials a deep orange to scarlet color and superior in build-up and chlorine fastness properties, represented by a free acid of the formula, STR1 wherein R1 is hydrogen, methyl or ethyl; R2 is an alkyl having 1 to 4 carbons that is either unsubstituted or substituted with hydroxy, cyano, alkoxy, halogen, carboxy, alkoxycarbonyl or sulfonic acid; Z is hydrogen or sulfonic acid; A is phenylene and is either unsubstituted or substituted with 1 or 2 substituents selected from the group consisting of methyl, ethyl, methoxy, ethoxy, chlorine, bromine and sulfonic acid, or natphthylene that is either unsubstituted or substituted with sulfonic acid; X is --SO2 CH=CH2 or --SO2 CH2 CH2 Y in which Y is a group that is splittable by alkalis; and m is an integer of 1 to 3.
Solid phase acylation of aminosulfonic acids
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, (2008/06/13)
This invention is directed to the acylation of aminosulfonic acids in the solid phase. Two discrete, sequential chemical reactions occur, i.e. (1) the neutralization of the aminosulfonic acid, and (2) the subsequent amine acylation, to produce an improved neutralized acyl-aminosulfonic acid at a reduced cost. Aminosulfonic acids having the general formula HO3 S-A-NH2 are acylated to neutralized acyl-aminosulfonic acids having the general formula RCONH-A-SO3 M, where A is an unsubstituted or substituted aliphatic, aromatic or heteroaromatic group and M is a neutralizing agent moiety. The yield is virtually quantitative.