Process for the preparation of pigments based on isoindole

Details Process for the preparation of pigments based on isoindole Process for the preparation of pigments based on isoindole

1990-10-16

1992-02-25

Shen, Cecilia

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

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

548471, C07D23936

Patent

active

050915320

ABSTRACT:
A new process for the preparation of pigments of the formula ##STR1## comprises first reacting phthalodinitrile in an organic medium in the presence of a base with an alcohol and then with a compound of the formula ##STR2## in the presence of water at a pH of 1-6.

REFERENCES:
patent: 4166179 (1979-08-01), Lotsch
patent: 4480097 (1984-10-01), Lotsch et al.
patent: 4751314 (1988-06-01), Hahn et al.
patent: 4845214 (1989-07-01), Lotsch et al.
patent: 4997740 (1991-03-01), Harnisch et al.
Pankratova et al., CA 86-1554486 (1977).
Mikhailov et al., Ca 87-7477r (1977).

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