Towards the Highly Efficient Synthesis and Selective Methylation of C(sp
<sup>3</sup>
)‐Bridged [6]Cycloparaphenylenes from Fluoren[3]arenes
作者:Xu‐Sheng Du、Da‐Wei Zhang、Yan Guo、Jing Li、Ying Han、Chuan‐Feng Chen
DOI:10.1002/anie.202102701
日期:2021.6
C[6]CPPs exhibited rigid belt-shaped structures with deep cavities. Moreover, C[6]CPPs exhibited high HOMO energies and narrow energy gaps. An unclosed belt was further obtained, and it not only showed a similar narrow energy gap to those of the aromatic belts, but also displayed strong fluorescence property, which can play a vital role in the design and synthesis of new aromatic belts.
开发了一种从芴[3]芳烃(F [3] As)高效合成C(sp3)-桥联的[6]环对亚苯基(C [6] CPPs)的方法。因此,合成了F [3] As作为一种新型的大环芳烃。随后进行去甲基化,三氟甲基化和分子内芳基-芳基偶联反应,然后可以方便地获得C [6] CPP。有趣的是,C [6] CPPs可以被选择性地甲基化以产生其完全被外部甲基取代的衍生物。晶体结构显示羟基取代的F [3] As具有碗形构象,而C [6] CPPs则显示出具有深腔的刚性带状结构。而且,C [6] CPPs表现出高的HOMO能量和窄的能隙。进一步获得了一条未封闭的带,它不仅显示出与芳族带相似的窄能隙,而且还显示出很强的荧光性,这在新型芳族带的设计和合成中起着至关重要的作用。