Process for the preparation of 6,13-dihydroquinacridones and qui

Details Process for the preparation of 6,13-dihydroquinacridones and qui Process for the preparation of 6,13-dihydroquinacridones and qui

1987-02-10

1989-03-14

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 56, 546 57, C09B 4800

Patent

active

048125687

ABSTRACT:
Process for the preparation of a 6,13-dihydroquinacridone of the general formula (I) ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 designate hydrogen or substituents customary for quinacridone, characterized in that an optionally substituted dialkyl 2,5-di-(phenylamino)-3,6-dihydroterephthalate is heated to temperatures of 240.degree.-320.degree. C. in an essentially oxygen-free atmosphere in the presence of a dimethyl-diphenyl ether isomer mixture of the formula ##STR2## as the solvent and/or diluent, and a process for the preparation of optionally substituted quinacridone, characterized in that the resulting 6,13-dihydroquinacridone is oxidized in the customary manner.

REFERENCES:
patent: 2821529 (1958-01-01), Struve
patent: 2969366 (1961-01-01), Griswold et al.
patent: 3007930 (1961-11-01), Manger et al.
patent: 3009916 (1961-11-01), Struve
patent: 3738988 (1973-06-01), Jackson
Wunderlich et al., Chemical Abstracts, vol. 73:27081w (1970).
Condensed Chemical Dictionary, 6th ed., Reinhold Publishing Co., New York, (1961, p. 419, "Dowtherm" A).
Dictionary of Organic Compounds, vol. 3: Din-Iza, Oxford University Press, New York (1965), pp. 1280 and 1311.

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