我室曹晓宇教授在 ACIE 上发表论文：Stable Diindeno‐Fused Corannulene Regioisomers with Open‐Shell Singlet Ground States and Remarkable Diradical Characters

文章链接：https://onlinelibrary.wiley.com/doi/10.1002/anie.201902028

摘要：

Synthesis of open‐shell polycyclic hydrocarbons with large diradical characters is challenging due to their high reactivity. Herein, two diindeno‐fused corannulene regioisomers DIC‐1 and DIC‐2, curved fragments of fullerene C104, were synthesized, exhibiting open‐shell singlet ground states. The incorporation of the curved and non‐alternant corannulene moiety within diradical systems leads to significant diradical characters as high as 0.98 for DIC‐1 and 0.89 for DIC‐2. Such high diradical characters can presumably be ascribed to the re‐aromatization of the corannulene π system. Although DICs have high diradical characters, they display excellent stability under ambient conditions. The half‐lives are 37 days for DIC‐1 and 6.6 days for DIC‐2 in solutions. This work offers a new design strategy towards diradicaloids with large diradical characters yet retaining high stability.