Naphthalenedisulfonic acid refers to organic compounds with the formula . They are derivatives of naphthalene. Twelve isomers are possible, but only a few have been examined in some depth, often as precursors to azo dyes or to various drugs. They are colorless solids with high solubility in water. Some derivatives are prepared by sulfonation of naphthalene or its monosulfonic acids. A few are produced by indirect routes.
+ Hydroxynaphthalenesulfonic acids name Registry number m.p., °C prepPrecursor to1,3-Naphthalenedisulfonic acid6094-26-4 250deamination 2-aminonaphthalene-6,8-disulfonic acidobscure1,5-Naphthalenedisulfonic acid, Armstrong acid81-04-9240-245sulfonation of naphthalene with oleum (together with 1,6-isomer)1-hydroxynaphthalene-5-sulfonic acid, 1,5-dihydroxynaphthalene, 1,3,5-naphthalenetrisulfonic acid1,6-Naphthalenedisulfonic acid525-37-1125sulfonation of naphthalene with oleum (together with 1,5-isomer)1,6-dihydroxynaphthalene, 1,3,6-naphthalenetrisulfonic acid1,7-Naphthalenedisulfonic acid5724-16-3? low T sulfonation of naphthalene-2-sulfonic acid in low yieldsobscure2,6-Naphthalenedisulfonic acid581-75-9? high T sulfonation of naphthalene2-hydroxynaphthalene-6-sulfonic acid and 2,6-dihydroxynaphthalene2,7-Naphthalenedisulfonic acid92-41-12? high T sulfonation of naphthalene 2-hydroxynaphthalene-7-sulfonic acid, 2,7-dihydroxynaphthalene -1-Aminonaphthalene-8-hydroxy-2,4-disulfonic acid (Chicago acid) 82-47-3 ? base hydrolysis of naphthosultam-2,4-disulfonic acid precursor to C.I. Direct Blue 1 199, Direct Blue 22, Direct Blue 76 In addition to these compounds, several naphthalenetrisulfonic acids are known as well as several hydroxy derivatives.
References