Process for the preparation of N,N'-disubstituted 1,4-diaminoanthraquinones

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United States of America Patent

PATENT NO 5639896
SERIAL NO

08647845

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
BAYER AKTIENGESELLSCHAFTKAISER-WILHELM-ALLEE 1 LEVERKUSEN 51373

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kalz, Dietmar Neunkirchen, DE 11 53
Michaelis, Stephan Odenthal, DE 28 128
Reinhardt, Karl-Heinz Leverkusen, DE 7 7
Schmitz, Reinold Odenthal, DE 9 68
Schroder, Josef Leverkusen, DE 2 19

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