The formal exchange of the pyrrole units of porphyrin by bipyrrole units provides the title compound 1. The hexadecaethyl derivative of 1 is the only isolable product of a MacDonald condensation of tetrapyrrolic as well as of dipyrrolic components. The new cyclooctapyrrole adopts a figure-eight conformation in the solid state as well as in solution.
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Bröring et al. (1995) studied this question.
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