Heterocyclic polynuclear pigments and process for preparing same

Details Heterocyclic polynuclear pigments and process for preparing same Heterocyclic polynuclear pigments and process for preparing same

1976-03-02

1977-09-13

Daus, Donald G.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260278, 106288Q, C09B 514

Patent

active

040481735

ABSTRACT:
New compounds are disclosed having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 may be the same or different and are selected from the class consisting of H, Cl and OCH.sub.3. They are useful as pigments. They are prepared by reacting a substituted or unsubstituted 1-aza-2-hydroxybenzanthrone with 2,3-dichloro-1,4-naphthoquinone, in the presence of pyridine, at a temperature between 80.degree. and about 120.degree. C.

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