Process for the preparation of a substituted or unsubstituted qu

Details Process for the preparation of a substituted or unsubstituted qu Process for the preparation of a substituted or unsubstituted qu

1990-10-12

1992-03-03

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 49, C09B 4800

Patent

active

050934970

ABSTRACT:
Process for the preparation of a substituted or unsubstituted quinacridone by oxidation of a substituted or unsubstituted dihydroquinacridone with oxygen or an oxygen-containing gas in the presence of alkali, a solvent or diluent and an oxygen transfer agent, which is characterized in that the oxidation is carried out in the presence of a quaternary ammonium compound.

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patent: 4956464 (1990-09-01), Bender
Starks et al., "Phase Transfer Catalysts" Academic Press, New York (1978) pp. 4-7.
Labana et al., Chemical Reviews, vol. 67, No. 1, 25 Jan. 1967, pp. 1-18.

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