FIELD: phthalocyanines, more particularly preparation of disulfoacid of cobalt 4,4', 4'',4'''-tetraoxyphthalocyanine which is used as a homogeneous catalyst in the reaction of oxidation of sodium n-propylmercaptide. SUBSTANCE: cobalt tetrachlorophthalocyanine is sulfonated. The reaction mixture is treated with nitrosylsulfuric acid in the presence of boric acid and copper monochloride. The process is carried out at a molar ratio of reagents in the range from 1:(4-6):(6-70)·10-3. EFFECT: increased yield of the desired product and simplified process. 1 tbl
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