Naphthionic Acid

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naphthionic acid [¦naf·thē¦än·ik ′as·əd]

(organic chemistry)

C₁₀H₆(NH₂)SO₃H White powder or crystals that decompose when heated; used to manufacture dyes.

Naphthionic Acid

l-naphthylamine-4-sulfonic acid; colorless crystals. Poorly soluble in water and alcohol. Naphthionic acid loses its water of crystallization upon heating to 130°C and, at higher temperatures, decomposes without melting to yield SO ₂.

Naphthionic acid is prepared from α-naphthylamine sulfate, C₁₀H₇NH ₂• H₂SO_4, by rearrangement into an at 180°-200°C. Naphthionic acid is an intermediate in the synthesis of azo dyes (for example, Congo red).

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