Naphthionic acid

Naphthionic acid
Names

IUPAC name 4-aminonaphthalene-1-sulfonic acid
Other names Piria's acid
Identifiers
CAS Number	84-86-6^[1]
ChEBI	CHEBI:38219
ChemSpider	6532
EC Number	201-567-9
Jmol interactive 3D	Image
InChI InChI=1S/C10H9NO3S/c11-9-5-6-10(15(12,13)14)8-4-2-1-3-7(8)9/h1-6H,11H2,(H,12,13,14) Key: NRZRRZAVMCAKEP-UHFFFAOYSA-N InChI=1/C10H9NO3S/c11-9-5-6-10(15(12,13)14)8-4-2-1-3-7(8)9/h1-6H,11H2,(H,12,13,14) Key: NRZRRZAVMCAKEP-UHFFFAOYAN
SMILES C1=CC=C2C(=C1)C(=CC=C2S(=O)(=O)O)N
Properties
Chemical formula	C₁₀H₉NO₃S
Molar mass	223.25 g·mol⁻¹
Density	1.68
Melting point	> 300 °C (572 °F; 573 K)
Solubility in water	soluble
Hazards
R-phrases	R22, R34
S-phrases	S25, S28A, S36, S37, S39, S45
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Naphthionic acid is an aromatic sulfonic acid. It appears as a light grey powder^[2] and is used in the synthesis of azo dyes such as Rocceline (a. k. a. Solid Red A), during which the amino group of the acid (in the form of a salt) is diazotated and then coupled with, in the case mentioned, β-naphthol.

References

↑ http://chemicalland21.com/specialtychem/finechem/NAPHTHIONIC%20ACID.htm
↑ 4-Amino-1-naphthalenesulfonic acid; MSDS No. 250619; Sigma–Aldrich Chemie GmbH: Steinheim, 29 Dec 2011.

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