Process for the preparation of N,N'-disubstituted 1,4-diaminoanthraquinones
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United States of America Patent
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Jun 17, 1997
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N/A
app pub date -
May 3, 1996
filing date -
May 10, 1995
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Expired
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Abstract
A process for the preparation of N,N'-disubstituted 1,4-diaminoanthraquinones has been found which is characterized in that 1,4-dihydroxyanthraquinones are reacted with aliphatic or aromatic amines in the presence of a hydroxycarboxylic acid as a condensation auxiliary.
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