Patent ID: 6972333
Filing Date: 2005-12-06
Classification: C09B

Abstract:
1. A process for preparing a quinacridonequinone of the formula wherein each R substituent is independently selected from hydrogen, halogen, a C 1 –C 10 -alkoxy, a C 1 –C 10 -alkyl, a substituted phenyl, and unsubstituted phenyl; comprising oxidizing, in the presence of a liquid medium and an oxidant selected from the group consisting of persulfuric acid, persulfuric acid salts, persulfuric acid derivatives, and combinations thereof, a quinacridone of the formula wherein each R substituent is independently selected from hydrogen, halogen, a C 1 –C 10 -alkoxy, a C 1 –C 10 -alkyl, a substituted phenyl and unsubstituted phenyl.