Angewandte Chemie International Edition
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Inside Back Cover: Azacalixphyrin: The Hidden Porphyrin Cousin Brought to Light (Angew. Chem. Int. Ed. 24/2013)
A porphyrin aza analogue that contains no pyrrol subunits absorbs in the entire visible region. D. Jacquemin, O. Siri, and co-workers show in their Communication on page 6250 ff. that the central 16-membered ring containing four nitrogen atoms has 18 delocalized π electrons, and is thus aromatic. This compound is analogous to both azacalixarenes and porphyrins, which is reflected in the name of this new family of macrocycles, azacalixphyrins.