Condensation of 3,4-diethylpyrrole with 1,3-diformylindane in the presence of catalytic HBr afforded, following oxidation with FeCl3, the first example of a dicarbaporphyrin in moderate yield; this novel bridged annulene system retains a strong diamagnetic ring current in 1H NMR spectroscopy as well as a porphyrin-like UV–VIS spectrum.
T. D. Lash, J. L. Romanic, M. J. Hayes and J. D. Spence, Chem. Commun., 1999, 819 DOI: 10.1039/A809639B
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