Green Light Triggered Radical Annulation for the Synthesis of Indenone by Metal‐Free Photocatalysis. - He, Xing; Ji, Jia‐Qi; Zhao, Meng‐Yan; Ma, Chun‐Hua; Zhang, Dan‐Dan; Xu, Gui‐Qing; Ding, Qing‐Jie; Cui, Zhen‐Wei; Jiang, Yu‐Qin (European Journal of Organic Chemistry, 2024)