1,2,5-Telluradiazoloporphyrazines: III. Detelluration of 1,2,5-Telluradiazolo­tribenzoporphyrazine and Its Conversion to Pyrazine-Fused Bis-phthalocyanine

Abstract

Treatment of Mg^II complex of tert-butyl substituted 1,2,5-telluradiazolotribenzoporphyrazine with acetic or trifluoroacetic acid leads, along with the demetallation of the macrocycle, to the expulsion of the Te atom and formation of diimino- and dioxoporphyrazines. Detelluration upon treatment with CF₃COOH in pyridine solution results in dimerization affording planar bisphthalocyanines with the bridge pyrazine moiety