Tobias acid

Tobias acid
Names
Preferred IUPAC name
2-Aminonaphthalene-1-sulfonic acid
Other names
2-Naphthylamine-1-sulfonic acid
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.001.211
EC Number
  • 201-331-5
UNII
  • 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
  • C1=CC=C2C(=C1)C=CC(=C2S(=O)(=O)O)N
Properties
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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