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Keywords:

  • alkyne coupling;
  • butadiyne bridge;
  • palladium;
  • porphyrinoids;
  • triporphyrin synthesis
Thumbnail image of graphical abstract

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.