The incorporation of an azulene bridge into an aromatic hexaphyrin framework allows manipulating π-electron delocalization pathways. The palladium(II) complex undergoes hydroxyl-triggered azulene contraction or isomerization to an oxynaphthalene unit, transforming the hexaphyrin framework into meso-linked carbaporphyrins. This converts the 26π-electron pathway into the 18π one.

中文翻译：

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芳香开关通过在薁变换薁桥接A，d-dithiahexaphyrin

将氮杂环戊二烯桥结合到芳族六卟啉骨架中允许操纵π电子离域化途径。钯（II）配合物经历羟基触发的氮杂苯缩合或异构化为氧萘单元，将六卟啉骨架转化为内消旋碳杂卟啉。这将26π电子路径转换为18π电子路径。