The Wyler's method for the synthesis of copper phthalocyanine was applied to quinolinic acid and cinchomeronic acid with cobalt salt to prepare cobalt-tetra-2, 3- pyridinoporphyrazine and cobalt-tetra-3, 4-pyridinoporphyrazine. Their optical absorption spectra of visible light and infra red light were measured and their properties as organic pigments and vat dyes investigated. The cobalt-phthalocyanine-N-isologs showed no change in crystal form when treated with aromatic solvents.
It was found that, when P-xylyiene dichloride was treated with aqueous methanol saturated with ammonia in the presence of ammonium carbonate, P-xylylenediamine (P-XDA) was formed in a good yield. The product P-XDA was isolated in the form of its N, N'-diacetyl derivative. The diacetyl-P-XDA was hydrolyzed with hydrochloric acid into P-XDA hydrochloride, from which the free base was obtained upon treatment with methanolic sodium hydroxide. In the course of ammonolysis, a large amount of 4-aminomethylbenzylcarbamic acid (AMBC) was precipitated. AMBC was obtainable in a pure state (mp 168173°C) from P-XDA, and was also readily converted into P-XDA and its derivatives in a good yield. AMBC is a new intermediate to P-XDA.