Process for the preparation of linear quinacridones

Details Process for the preparation of linear quinacridones Process for the preparation of linear quinacridones

1986-05-01

1988-07-19

Gerstl, Robert

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546 36, 546 41, 546 56, 546 57, C09B 4800

Patent

active

047586648

ABSTRACT:
Process for the preparation of linear quinacridones of the formula (1) ##STR1## in which R denotes a hydrogen, fluorine, chlorine or bromine atom or a C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.3 -alkoxy or phenyl group or a fused benzene ring or a phenylamino or phenoxy group which can be substituted on the aromatic nucleus by fluorine, chlorine or bromine atoms or C.sub.1 -C.sub.4 -alkyl groups, and n denotes a number from 0 to 2, it being possible, in the event that n.noteq.0, for the substituents R present on the same benzene ring or on the two benzene rings to be identical or different, by the oxidation of linear 6,13-dihydroquinacridones of the formula (2) ##STR2## in which R and n have the meanings mentioned above, which comprises heating, at temperatures from about 180.degree. C. to about 280.degree. C., 1 mole of the last-mentioned compounds with 1 to 2 moles of iodine in a high-boiling organic solvent which is inert towards the reactants.

REFERENCES:
patent: 2969366 (1961-01-01), Griswold et al.
patent: 3007930 (1961-11-01), Manger et al.
patent: 3009916 (1961-11-01), Struve
patent: 3045040 (1962-07-01), Deuschel
patent: 4258190 (1981-03-01), Taggi
Labana et al., Chem. Reviews 67, 1-18 (1967).
Horiguchi, et al., Chemical Abstracts, vol. 72:13825j (1970).

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