Phase-directed preparation of metal-free phthalocyanine

Details Phase-directed preparation of metal-free phthalocyanine Phase-directed preparation of metal-free phthalocyanine

1997-12-16

1999-08-03

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540141, 540122, 106410, 106412, 106272, 106493, C09B 4704

Patent

active

059327235

ABSTRACT:
A process for preparing metal-free phthalocyanine by reductive cyclization of phthalonitrile in the presence of an aliphatic alcohol, of a redox catalyst and of an inorganic base comprises effecting the cyclization in the presence of one or more phthalocyanine derivatives selected from the group consisting of phthalocyanine-sulfonic acids and -carboxylic acids and their alkali metal, ammonium and alkylarnozium salts, the amino-substituted and aminomethylated phthalocyanines and their reaction products with alkylating agents, sulfonic acids, sulfonyl chlorides and carbonyl chlorides, the imidomethylene- and amidomethylene-substituted phthalocyanines, the alkyl-, aryl- and cyano-substituted phthalocyanines, the hydroxyl- and alkoxy-substituted phthalocyanines and their reaction products with tetraalkyl- and tetraalkoxy-silanes and the halogenated phthalocyanines.

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Shigemasa Takano, et al., Chemistry Letters, pp. 2037-2040, 1984, "A New Polymorph of Metal-Free Phthalocyanine".

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