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Sumito Tokuji, Prof. Dr. Hideki Yorimitsu and Prof. Dr. Atsuhiro Osuka Inside Cover: Preferential Formation of Cyclic Trimers by Palladium-Catalyzed Oxidative Coupling Reactions of 2,18-Diethynylporphyrins (Angew. Chem. Int. Ed. 49/2012) Angewandte Chemie International Edition 51

Article first published online: 23 NOV 2012 | DOI: 10.1002/anie.201208940

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Cyclic porphyrin oligomers are difficult to obtain efficiently. In their Communication on page 12357 ff., A. Osuka, H. Yorimitsu, and S. Tokuji show Pd-catalyzed trimerization of 2,18-diethynylporphyrins. Hexaporphyrins with meso–meso directly linked porphyrins can be used to model a light-harvesting antenna. The crystal structure of the trimer resembles the family crest of Mitsuba-aoi (three leaves of Hollyhock), which is the famous crest of the Tokugawa clan.

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