Tobias acid (2-amino-1-naphthalenesulfonic acid) is an
organic compound with the formula C
10H
6(SO
3H)(NH
2). It is named after the German chemist Georg Tobias. It is one of several
aminonaphthalenesulfonic acids, which are derivatives of
naphthalene
Naphthalene is an organic compound with formula . It is the simplest polycyclic aromatic hydrocarbon, and is a white crystalline solid with a characteristic odor that is detectable at concentrations as low as 0.08 ppm by mass. As an aromati ...
containing both
amine and
sulfonic acid
In organic chemistry, sulfonic acid (or sulphonic acid) refers to a member of the class of organosulfur compounds with the general formula , where R is an organic alkyl or aryl group and the group a sulfonyl hydroxide. As a substituent, it is kn ...
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.
[Gerald Booth "Naphthalene Derivatives" in ''Ullmann's Encyclopedia of Industrial Chemistry'', 2005, Wiley-VCH, Weinheim. .]
References
External links
2-Amino-1-naphthalenesulfonic acid NIST Standard Reference Data Program
Naphthylamines
Sulfonic acids
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