The never-ending pursuits for exploring aromatic molecular architectures result in the large libraries of aromatics with fascinating structures, which have greatly broadened the scope of aromaticity. Despite extensive efforts that have been paid to develop aromatic frameworks, the construction of polycyclic aromatics that share a bridgehead atom with more than three rings has never been accomplished. Here, an unprecedented family of aromatics, in which a metal center shared by 4 five-membered aromatic rings, has been achieved by using the metalla-click reactions with excellent yields and remarkable regioselectivity. The distinctive tetracyclic aromatics exhibit a broad absorption in the ultraviolet-visible near-infrared region and excellent thermal stability in air, enabling their potential applications in photoelectric materials and biomedicine. This study now makes it possible to incorporate four aromatic rings with one common sharing metal center by a straightforward strategy that would promote further development of previously unknown polycyclic complex motifs in aromatic chemistry.

中文翻译：

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通过金属点击反应与桥头金属获得四环芳烃。


对芳香分子结构探索的永无止境的追求产生了具有迷人结构的大型芳香化合物库，这极大地拓宽了芳香性的范围。尽管人们为开发芳族骨架付出了广泛的努力，但与三个以上环共享桥头原子的多环芳族化合物的构建从未实现。在这里，通过使用金属点击反应获得了前所未有的芳族化合物家族，其中由 4 个五元芳环共享金属中心，具有优异的产率和显着的区域选择性。独特的四环芳烃在紫外-可见近红外区域表现出广泛的吸收，并且在空气中具有优异的热稳定性，使其在光电材料和生物医学方面具有潜在的应用。这项研究现在使得通过一种简单的策略将四个芳香环与一个共同的共享金属中心结合起来成为可能，这将促进芳香化学中以前未知的多环复杂基序的进一步发展。