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Keywords:

  • aromaticity;
  • bridged annulenes;
  • carbaporphyrins;
  • fulvenes;
  • indenes
Thumbnail image of graphical abstract

Porphyrin without N: Bilin analogues and related aromatic dicarbaporphyrinoids have been prepared from bis(3-indenyl)methane. Even though all four pyrrole rings from the porphyrin macrocycle have been replaced by two furan and two indene subunits, the system retains porphyrin-like UV/Vis spectra and highly diatropic characteristics.