Hydroxynaphthalenesulfonic acid refers to organic compounds with the formula . Several are precursors to azo dyes and to various aminonaphthalenesulfonic acids. They are colorless solids with high solubility in water.
+ Hydroxynaphthalenesulfonic acids name Registry number m.p., °C prepPrecursor to1-Hydroxynaphthalene-2-sulfonic acid "Baum’s acid"567-18-0 250by low T sulfonation of 1-naphthol together with 4-hydroxynaphthalene-2-sulfonic acid1-Hydroxynaphthalene-3-sulfonic acid3771-14-0?acid hydrolysis of 1-aminonaphthalene-3-sulfonc acid1-Hydroxynaphthalene-4-sulfonic acid "Nevile and Winther’s acid", "N&W acid"84-87-7170by low T sulfonation of 1-naphthol together with 4-hydroxynaphthalene-2-sulfonic acid C.I. Acid Orange 19, C.I. Mordant Brown 35, C.I. Food Red 31-Hydroxynaphthalene-5-sulfonic acid "oxyL acid", "Azurin acid"117-59-9azurin acid base hydrolysis of 1,5-naphthalenedisulfonic acidC.I. Pigment Red 54, C.I. Mordant Black 291-Hydroxynaphthalene-6-sulfonic acid16500-22-4? obscure 1-Hydroxynaphthalene-7-sulfonic acid20191-62-2? obscuredesulfonation of 1-hydroxy-2,7- and 1-hydroxy-4,7-disulfonic acids1-Hydroxynaphthalene-8-sulfonic acid117-22-6106 (monohydrate)?C.I. Acid Black 54, C.I. Acid Blue 1582-Hydroxynaphthalene-1-sulfonic acid "oxy Tobias acid", "Stebbins acid" 567-47-5115low T sulfonation of 2-naphthol 2-aminonaphthalene-1-sulfonic acid (Tobias acid)2-Hydroxynaphthalene-3-sulfonic acid16435-40-8?obscure2-Hydroxynaphthalene-4-sulfonic acid6357-85-3?by desulfonation of 2-hydroxynaphthalene-4,8-di-sulfonic acid2-Hydroxynaphthalene-5-sulfonic acid20386-27-0?obscure2-Hydroxynaphthalene-6-sulfonic acid93-01-6129 (monohydrate)sulfonation of 2-naphtholC.I. Acid Orange 12, C.I. Food Yellow 3, C.I. Food Orange 22-Hydroxynaphthalene-7-sulfonic acid "Cassella's acid"RN [92-40-089 (monohydrate)?2-aminonaphthalene-7-sulfonic acid ,2-hydroxynaphthalene-3,7-disulfonic acid, 2,7-dihydroxynaphthalene 2-Hydroxynaphthalene-8-sulfonic acid croceic acid132-57-0?C.I. Acid Red 25 Related compounds In addition to these compounds, several dihydroxynaphthalenes, naphthalenedisulfonic acids, naphthalenetrisulfonic acids, hydroxynaphthalenedisulfonic acids, hydroxynaphthalenetrisulfonic acids, and aminonaphthalenesulfonic acids are valuable.
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