Before revision: 1-Aminonaphthalenesulfonic acids IsomerCAS Registry NumberAlternative namesPreparative route, notes 1-Aminonaphthalene-4-sulfonic acid 84-86-6Piria’s acid, naphthionic acidsulfonation of 1-aminonaphthalene, precursor to acid red 25, C.I.
After revision: 1-Aminonaphthalenesulfonic acids Isomer CAS Registry Number Alternative names Preparative+ route, notes 1-Aminonaphthalene-4-sulfonic acid 84-86-6Piria’s acid, naphthionic acidsulfonation of 1-aminonaphthalene, precursor to acid red 25, C.I.