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Setting the 'cene: The structural features of ferrocenophanes and porphyrinoids are combined in ferrocene–porphyrin hybrids. Ferrocenothiaporphyrin (see picture, green) and dihydroferrocenothiaporphyrin (red) are macrocyclic antiaromatic and aromatic systems, respectively. These two systems provide evidence for direct transmission of π-electron conjugation across a d-electron metallocene.
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Simkowa et al. (2010) studied this question.
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