Process for the preparation of n,n'-disubstituted...

Details Process for the preparation of n,n'-disubstituted... Process for the preparation of n,n'-disubstituted...

C - Chemistry, Metallurgy

07

C

C07C 50/18 (2006.01) C07C 221/00 (2006.01) C09B 1/16 (2006.01) C09B 1/28 (2006.01) C09B 1/32 (2006.01) C07C 225/34 (2006.01)

Patent

CA 2428957

Process for the preparation of N,N'-disubstituted 1,4-dianinoanthraquinones Image in which R is an aliphatic or aromatic radical, characterized in that 1,4-dihydroxyanthraquinones are reacted with aliphatic or aromatic amines in the presence of a readily water-soluble, dipolar-aprotic solvent (e.g. NMP) and of a second solvent, different from the first.

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