Visible Light Photocatalysis of [2+2] Styrene Cycloadditions by Energy Transfer
作者:Zhan Lu、Tehshik P. Yoon
DOI:10.1002/anie.201204835
日期:2012.10.8
Hip to be square: Styrenes participate in [2+2] cycloadditions upon irradiation with visible light in the presence of an iridium(III) polypyridyl complex. In contrast to previous reports of visible light photoredox catalysis, the mechanism of this process involves photosensitization by energy transfer and not electron transfer.
[3+2] Cycloadditions of Aryl Cyclopropyl Ketones by Visible Light Photocatalysis
作者:Zhan Lu、Meihua Shen、Tehshik P. Yoon
DOI:10.1021/ja107849y
日期:2011.2.9
We report a new method for the formal [3+2] reaction of aryl cyclopropyl ketones with olefins to generate highly substituted cyclopentane ring systems. The key initiation step in this process is the one-electron reduction of the ketone to the corresponding radical anion, which is accomplished using a photocatalytic system comprising Ru(bpy)(3)(2+), La(OTf)(3), and TMEDA.