Preparation of 1-amino-4-hydroxyanthraquinones

Details Preparation of 1-amino-4-hydroxyanthraquinones Preparation of 1-amino-4-hydroxyanthraquinones

2005-04-26

2005-04-26

Badio, Barbara P. (Department: 1616)

Organic compounds -- part of the class 532-570 series

Organic compounds

Polycyclo ring system containing anthracene configured ring...

C552S245000

Reexamination Certificate

active

06884899

ABSTRACT:
The present invention relates to a process for preparing 1-amino-4-hydroxyanthraquinones of the formula (I)wherein R is an aliphatic or aromatic radical,by reacting 1,4-dihydroxyanthraquinone, optionally as a mixture with 2,3-dihydro-1,4-dihydroxyanthraquinone, with aliphatic or aromatic amines in the presence of N-methyl-2-pyrrolidone.

REFERENCES:
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patent: 3654319 (1972-04-01), Neeff
patent: 4309221 (1982-01-01), Neeff et al.
patent: 2 041 374 (1972-02-01), None
patent: 914453 (1963-01-01), None
patent: 2013701 (1979-08-01), None

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