6259-66-1O=S(=O)(O)c1cc(S(=O)(=O)O)c2cc(O)c(S(=O)(=O)O)cc2c1ANYNWDCUWOSEFH-UHFFFAOYSA-N6259-66-1DTXSID902116282-Hydroxynaphthalene-3,6,8-trisulfonic acid [6259-66-1]. (7-hydroxynaphthalene-1,3,6-trisulfonic acid), C10H8O10S3, Mr 384.3, and its alkali-metal salts are readily soluble in water; nevertheless, the sodium salt is obtainable by salting out. Amination at 240℃ gives 2-aminonaphthalene-3,6,8-trisulfonic acid. Alkali fusion gives a mixture of dihydroxynaphthalenedisulfonic acids and finally 4,6,7- trihydroxynaphthalene-2-sulfonic acid. Diazo coupling occurs slowly in the 1-position.
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