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7,8‐Dehydropurpurin has attracted much attention owing to the dual 18π‐ and 20π‐electron circuits in its macrocyclic conjugation. The two‐fold Pd‐catalyzed [3+2] annulation of meso‐bromoporphyrin with 1,4‐diphenylbutadiyne furnished 7,8‐dehydropurpurin dimers. The 8a,8a‐linked dimer displays a red‐shifted and enhanced absorption band in the NIR region and a small electrochemical HOMO–LUMO band gap...
Interne Brücken: Die [26]Hexaphyrine mit einer aromatischen Brücke in 5,20‐Position weisen potenziell zwei cyclische konjugierte Netzwerke auf – ein [18]Phorphyrin und ein [26]Hexaphyrin (siehe Bild) – und sind formal analog zu den [18]Annuleno[18]annulenen. Die 1,3‐Phenyl‐, 2,5‐Thienyl‐ und 2,5‐Pyrrolyl‐verbrückten [26]Hexaphyrine wurden synthetisiert und charakterisiert.
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