Preparation of dihydroquinacridones, quinacridones and quinacrid

Details Preparation of dihydroquinacridones, quinacridones and quinacrid Preparation of dihydroquinacridones, quinacridones and quinacrid

1988-10-27

1990-09-11

Rivers, Diana G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 49, 546 56, C09B 4800

Patent

active

049564641

ABSTRACT:
Dihydroquinacridones, quinacridones and quinacridonequinones are prepared by cyclizing 2,5-dianilino-3,6-dihydroterephthalic acid derivatives or 2,5-dianilinoterephthalic acid derivatives in the liquid or solid state or in solution, in each case in finely divided form, or in the gas phase, in the presence or absence of an oxidizing agent.

REFERENCES:
patent: 2460538 (1949-02-01), Schneider
patent: 2821529 (1958-01-01), Struve
patent: 3107248 (1963-10-01), Cooper
patent: 3133071 (1964-05-01), Nelson
patent: 3907805 (1975-09-01), Lin
patent: 4017496 (1977-04-01), Hanke

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