Cleves Acid

Name:
Cleves Acid
Detailed information:

Chemistry name:	1-naphthylamine-6-sulfonic acid
Properties:
Colorless needles. Mp >330C. Slightly soluble in water.
Derivation:
Nitration of naphthalene-β-sulfonic acid. On reduction with iron, this yields a mixture of 1-naphthylamine-6-sulfonic acid (Cleve's acid) and 1-naphthylamine-7-sulfonic acid (or Cleve's acid-1,7). The latter is separated by crystallization as the sodium salt, the 1,6-acid precipitates on acidification.
Use:
Azo dye intermediate.