Preparation of dianthraquinone-N,N'-dihydroazine and its chlorin

Details Preparation of dianthraquinone-N,N'-dihydroazine and its chlorin Preparation of dianthraquinone-N,N'-dihydroazine and its chlorin

1993-04-30

1994-09-27

Berch, Mark L.

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

544341, C07D24146

Patent

active

053508530

ABSTRACT:
A process for preparing dianthraquinone-N,N'-dihydroazine (I) ##STR1## and its chlorination products (Ia) ##STR2## where n is 1 or 2, by condensation of 1-aminoanthraquinone (II) in the presence of an alkaline condensing aid, an oxidizing agent and a cyclic urea derivative at from 80.degree. to 150.degree. C. and subsequent purification and/or chlorination comprises using N,N'-dimethylpropyleneurea as the urea derivative.

REFERENCES:
patent: 3268532 (1966-08-01), Zerweek
patent: 4628091 (1986-12-01), Kato et al.
Hirayama, Chemical Abstracts, vol. 107, No. 12, Sep. 1987, AN-98205w, JP-A-62 025 167, Feb. 3, 1987.

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