The Polycyclo Ring System Is Tetracyclic Patents (Class 552/216)
  • Preparation of anthraquinone imide compounds
    Patent number: 5525743
    Abstract: The preparation of anthraquinone imide compounds by condensation of anthraquinone compounds containing at least one primary amino group with halogenized aromatics or by condensation of halogenized anthraquinone compounds with primary aromatic amines, in the presence of a vat-dyeing catalyst and an acid-binding agent in an organic solvent, in which the organic solvent used is an alkyl benzoate.
    Type: Grant
    Filed: October 21, 1994
    Date of Patent: June 11, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Udo Bergmann, Helmut Hoch, Heike Kilburg, Reinhold Kohlhaupt, Matthias Niedenbrueck