Tobias acid explained

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.^[1] 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.^[2]

External links

• 2-Amino-1-naphthalenesulfonic acid, NIST Standard Reference Data Program

Notes and References

1. Tobias . Georg . Zur Anwendung der Sandmeyer' schen Reaction auf Diazosulfosäuren und über die Zersetzung dieser Verbindungen bei Gegenwart von Kupfer oder Kupferoxydul . Berichte der Deutschen Chemischen Gesellschaft . January 1890 . 23 . 1 . 1628–1634 . 10.1002/cber.189002301270 . On the application of Sandmeyer's reaction to diazosulfonic acids and the decomposition of these compounds in the presence of copper or copper oxide . German.
2. Gerald Booth "Naphthalene Derivatives" in Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim. .