Novel methods of syntheses of phthalocyanine compounds

Abstract From the Canadian patent

The present invention provides improved methods for synthesizing phthalocyanines, particularly HOSiPcOSi(CH3)2(CH2)3N(CH3)2 which do not , involve photolysis, and which produces purity of at least about 95 % and in , the preferred embodiment of the first method of synthesis provide a yield of greater than about 70 % and typically greater than 80 %. The first method involves a method for synthesizing a phthalocyanine compound comprising the following steps: providing a phthalocyanine precursor having a central silicon; adding a first aminosiloxy ligand to the central silicon of the phthalocyanine precursor adding a second aminosiloxy ligand to the central silicon of the phthalocyanine …