The 18π-σ3- and 22π-σ4- phosphaporphyrins were successfully prepared by an acid-promoted condensation between a phosphatripyrrane and a 2,5-bis[hydroxy(phenyl)methyl]pyrrole, and their structures, aromaticity, and optical and electrochemical properties were disclosed. Notably, a σ4-phosphaporphyrinogen and the 18π-σ3-phosphaporphyrin undergo oxidative π-extension at the peripherally fused carbocycle to afford the 22π-σ4- phosphaporphyrin.
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