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Sumito Tokuji, Prof. Dr. Hideki Yorimitsu and Prof. Dr. Atsuhiro Osuka Preferential Formation of Cyclic Trimers by Palladium-Catalyzed Oxidative Coupling Reactions of 2,18-Diethynylporphyrins Angewandte Chemie International Edition 51

Version of Record online: 9 NOV 2012 | DOI: 10.1002/anie.201207763

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And palladium makes three: In contrast to the formation of cyclic dimers in the Cu-mediated reaction, Pd-catalyzed oxidative coupling of 2,18-diethynylporphyrins preferentially produced cyclic trimers (see scheme). A porphyrin hexamer with a doubly 1,3-butadiyne-bridged conjugated trimeric core and directly meso-appended peripheral porphyrin substituents was also synthesized.

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