Tobias acid

Tobias acid
Names
	Preferred IUPAC name 2-Aminonaphthalene-1-sulfonic acid
	Other names 2-Naphthylamine-1-sulfonic acid
Identifiers
CAS Number	81-16-3;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL3182507;
ChemSpider	6418;
ECHA InfoCard	100.001.211
EC Number	201-331-5;
PubChem CID	6670;
UNII	F9QKW1FCE0;
CompTox Dashboard (EPA)	DTXSID7020922 ;
	InChI InChI=1S/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) Key: GWIAAIUASRVOIA-UHFFFAOYSA-N;
	SMILES C1=CC=C2C(=C1)C=CC(=C2S(=O)(=O)O)N;
Properties
Chemical formula	C10H9NO3S
Molar mass	223.25 g·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Tobias acid (2-amino-1-naphthalenesulfonic acid) is an organic compound with the formula C₁₀H₆(SO₃H)(NH₂). It is named after the German chemist Georg Tobias. It is one of several aminonaphthalenesulfonic acids, which are derivatives of naphthalene containing both amine and sulfonic acid functional groups. It is a white solid, although commercial samples can appear otherwise. It is used in the synthesis of azo dyes such as C.I. Acid Yellow 19 and C.I. Pigment Red 49. It is prepared via the Bucherer reaction of 2-hydroxynaphthalene-1-sulfonic acid with ammonia and ammonium sulfite.

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