Contracting porphyrins: An important step on the way to the as-yet unrealized contracted porphyrin, the so-called subporphyrin, is a tribenzosubporphyrin (see structure). The new system, which is closely related to boronsubphthalocyanines, comprises a 14-π-electron aromatic core and adopts a nonplanar bowl-shaped conformation.
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Tomás Torres⊗ (2006) studied this question.
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