An upswing for porphyrin isomers! Until the discovery of porphycene, the possibility that tetrapyrrolic macrocycles isomeric to porphyrin could exist was completely ignored. Now a new porphyrin isomer, termed corrphycene, has been synthesized as its tetraethyltetramethyl derivative 1 through a reductive carbonyl coupling. Isomer 1 has a planar ring framework and acts as a surprisingly good porphyrin-like ligand, even though its central N4 coor-dination core has a trapezoidal shape.
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Sessler et al. (1994) studied this question.
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