Preparation of 5-halo-2-(1-anthraquinonylamino)-benzoic acids and 4'-halo-2,1(N)-anthraquinonyl-1',2'(N)-benzacridones
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United States of America Patent
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Mar 28, 1995
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N/A
app pub date -
Jun 23, 1993
filing date -
Jul 1, 1992
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Expired
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Abstract
There are described the preparation of 5-halo-2-(1-anthraquinonylamino)benzoic acids of the general formula I ##STR1## (X.sup.1 : Cl or Br; X.sup.2 : H, Cl or Br, identical or different when n>1; n: 1-6) by reacting 2-(1-anthraquinonylamino)benzoic acids II ##STR2## with the halogen in the presence of sulfuric acid, and the preparation of 4'-halo-2,1(N)-anthraquinonyl-1',2'(N)-benzacridones III ##STR3## by cyclizing condensation of the acids I.
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