Process for the preparation of quinacridones from dihydroquinacr

Details Process for the preparation of quinacridones from dihydroquinacr Process for the preparation of quinacridones from dihydroquinacr

1994-08-08

1996-03-26

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 56, C09B 4800

Patent

active

055021921

ABSTRACT:
An aqueous phase air oxidation process for the for the preparation of unsubstituted and substituted quinacfidone pigments is disclosed. The process involves an oxidation step wherein a 6,13-dihydroquinacridone is convened to the corresponding quinacfidone, utilizing a quinone compound and molecular oxygen as oxidizing agent, in a basic, aqueous reaction medium, in the presence of a nonionic, polar organic material which forms a second liquid phase in the basic reaction medium and which is present in a minor amount relative to the amount of aqueous base in the reaction medium. The quinacridones prepared by this process are useful as pigments.

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Derwent Abstr 67912A/38 of JP 5394334 (1978).
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