Naphthalenesulfonate

Naphthalenesulfonates are derivatives of sulfonic acid which contain a naphthalene functional unit. A related family of compounds are the aminonaphthalenesulfonic acids. Of commercial importance are the alkylnaphthalene sulfonates, which are used as superplasticizers in concrete. They are produced on a large scale by condensation of naphthalenesulfonate or alkylnaphthalenesulfonates with formaldehyde.

Examples include:
 * amaranth dye
 * amido black
 * armstrong's acid
 * congo red
 * Evans blue
 * suramin
 * trypan blue