Preparation of metal-free phthalocyanines

Details Preparation of metal-free phthalocyanines Preparation of metal-free phthalocyanines

1978-03-09

1979-03-20

Edmundson, F.C.

Chemistry: electrical and wave energy

Processes and products

204 72, 204 74, C25B 304, C07D20700, C09B 4704

Patent

active

041452640

ABSTRACT:
Metal-free phthalocyanines (PC) are prepared by electrolysis, at inert electrodes, of aromatic o-dinitriles in organic liquids which contain small amounts of dissolved electrolytically conductive compounds, in the presence of hydrogen or of a compound which eliminates hydrogen under the reaction conditions and in the presence of alkaline compounds (as activators). The PC formed may be isolated in the pure form by filtration. The product contains from 90 to 99% of PC. It is used for the preparation of PC-based pigments.

REFERENCES:
patent: 3485726 (1969-12-01), Misono et al.
patent: 3511765 (1970-05-01), Beck et al.
Introduction to Organic Electrochemistry by Rifi et al., pp. 236-239 pub. by Marcel Dekker, Inc. N.Y. 1974.

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