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Macrocyclic aromaticity is the most important concept in porphyrin chemistry. We propose a general graph-theoretical procedure for predicting the main macrocyclic conjugation pathway in porphyrinoids. This procedure, based on calculated bond resonance energies (BREs), can be applied not only to natural and expanded porphyrins but also to porphyrinoids with fused rings. Main macrocyclic conjugation...
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