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Additional recommended knowledge
In contrast to aromatic nitration and other electrophilic aromatic substitutions this reaction is reversible. Sulfonation takes place in strong acidic conditions and desulfonation is the mode of action in a hot aqueous acid.
It is very useful in protecting a piece of an aromatic compound because of this reversibility. See Aromatic Hydration.
Aromatic sulfonic acids are intermediates in the preparation of dyes and many pharmaceuticals. Sulfonation of aniline produces p-aminobenzenesulfonic acid or sulfanilic acid which is a zwitterion with an unusual high melting point. The amide of this compound and related compounds form a large group of sulfa drugs.
Sulfonation of polystyrene can be used to prepare sodium polystyrene sulfonate.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Aromatic_sulfonation". A list of authors is available in Wikipedia.|