Verfahren zur Herstellung eines Pigmentes aus der Tetraazaporphinreihe.

摘要

D 1-Tetrahydrophthalonitrile is obtained by dehydrating the cyanhydrin of 2-cyanocyclohexanone.ALSO:The invention comprises violet colouring matters of the formula: where Me represents a metal or two hydrogen atoms, the hydrogen atoms of the cycloalkyl ring may be replaced by substituents, and R1, R2, R3, R4, R5 and R6 may be hydrogen atoms or hydrocarbon radicals or substituted hydrocarbon radicals, or any or all of the pairs of substituents R1 and R2, R3 and R4 R5 and R6 may be joined together to form an alicyclic, aromatic or quinonoid ring. They are made by (1) heating with a metal or metal compound a substituted and/or unsubstituted D 1-tetrahydrophthalonitrile or a mixture of a D 1-tetrahydrophthalonitrile with a phthalonitrile and/or maleic dinitrile and/or a maleic or fumaric dinitrile substituted by one or two hydrocarbon radicals or substituted hydrocarbon radicals; (2) heating the metal-free tetra-aza-porphin with a metal or metal compound; (3) heating with urea or a heat decomposition product thereof and a metal or metal compound a substituted or unsubstituted D 1-tetrahydrophthalic acid or functional derivative thereof or a mixture of one of these with a second substituted D 1-tetrahydrophthalic acid, and/or a phthalic acid and/or a maleic acid substituted by one or two hydrocarbon or substituted hydrocarbon radicals, or with functional derivatives of any of these acids, preferably in presence of a substance consisting of or containing molybdenum or wolfram. In examples: (1) D 1-tetrahydrophthalic anhydride and D 1-tetrahydrophthalonitrile are each reacted in presence of ammonium molybdate with urea and nickel chloride, cobaltous chloride, or a mixture of cuprous and cupric chloride, sometimes in presence of nitrobenzene, and/or a stream of ammonia gas; (2) D 1-tetrahydrophthalimide, 1-cyano-2-carbethoxy-D 1-cyclohexene, or a mixture of D 1-tetrahydrophthalic anhydride and either dimethylmaleic anhydride or phthalic anhydride are each heated in presence of ammonium molybdate with urea, nickel chloride, and nitrobenzene; (3) D 1-tetrahydrophthalonitrile is heated with sodium in amyl alcohol, the sodium compound is dematallized with methanol, and the metal-free pigment is boiled in quinoline with nickel, cobalt, or copper acetate. Other diluents specified are dichlorobenzene, chlornaphthalene, and kerosene, other metal compounds specified are chromium, ferrous, and manganese chlorides, and the metal oxides, and other functional derivatives specified are the amide, ammonium salt, and the mononitrile derived from the corresponding dibasic acid or the amide, ammonium salt, or ester thereof.