Preparation of 1-amino-4-hydroxyanthraquinones

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

C - Chemistry, Metallurgy

07

C

C07C 50/18 (2006.01) C07C 46/02 (2006.01) C07C 221/00 (2006.01) C07C 231/12 (2006.01) C09B 1/514 (2006.01) C07C 225/36 (2006.01) C07C 233/43 (2006.01)

Patent

CA 2397894

The present invention relates to a process for preparing 1-amino-4- hydroxyanthraquinones of the formula (I) (see 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.

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