A series of (porphyrin)–(C≡C)2–C6H4–R1 (R1 = NO2, H, Me, and OMe) were synthesized by the oxidative coupling of ethynyl porphyrins and phenylacetylenes in the presence of copper(II) acetate in pyridine. Electronic and electrochemical spectra of the compounds with R1 = H, Me, and OMe are quite similar, while pronounced change was observed for the compound with R1 = NO2, especially for the meso-substituted one, indicating that intramolecular charge transfer is responsible for the difference.
Durch Umsetzung der Acetophenone (I) mit den Ketenthioacetalen (II) und (IV) in Gegenwart von Kaliumhydroxid und Dimethylformamid entstehen die 2‐Pyrone (III) bzw. (V).
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