Naphthionic acid
Chemical compound
Naphthionic acid is an organic compound with the formula C10H6(NH2)(SO3H). It is one of several aminonaphthalenesulfonic acids, which are derivatives of naphthalene containing both amine and sulfonic acid functional groups. Naphthionic acid is a white solid, although commercial samples can appear gray. Deprotonation of naphthionic acid gives the sulfonate C10H6(NH2)(SO3)−, which is call naphthionate.
01Production and reactions
Naphthionic acid is prepared by treating 1-aminonaphthalene with sulfuric acid.
Naphthionic acid is used in the synthesis of azo dyes such as Rocceline (also known as Solid Red A). For this conversion sodium naphthionate is diazotated. The resulting diazonium derivative is coupled with β-naphthol.
Heating a solution of sodium naphtionate induces its conversion to 1-aminonaphthalene-2-sulfonate.
Sources and credits
This article is adapted from the Wikipedia article “Naphthionic acid”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- Naphthionic acid.svg by Esmu Igors, Public domain
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