Polyfunctional aromatic imines with a zwitterionic character involving sulfonic acid and N,N-dimethylamino functionalities are synthesized by oxidative condensation of 5-aminonaphthalene-2-sulfonic acid (Cleve's β-acid) and N,N-dimethyl-p-phenylenediamine.
S. Coen, L. Martinet-Reboul and A. Périchaud, J. Chem. Res. (S), 1999, 592 DOI: 10.1039/A904904E
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