Visible-Light-Enabled Paternò–Büchi Reaction via Triplet Energy Transfer for the Synthesis of Oxetanes
作者:Katie A. Rykaczewski、Corinna S. Schindler
DOI:10.1021/acs.orglett.0c02316
日期:2020.8.21
synthesize oxetanes is the light-enabled [2 + 2] cycloaddition reaction of carbonyls and alkenes, referred to as the Paternò–Büchi reaction. The reaction conditions for this transformation typically require the use of high energy UV light to excite the carbonyl, limiting the applications, safety, and scalability. We herein report the development of a visible-light-mediated Paternò–Büchi reaction protocol
Divergent Photocatalytic Reactions of α-Ketoesters under Triplet Sensitization and Photoredox Conditions
作者:Jian Zheng、Xiao Dong、Tehshik P. Yoon
DOI:10.1021/acs.orglett.0c02314
日期:2020.8.21
The long-lived triplet excited states of transition metal photocatalysts can activate organic substrates via either energy- or electron-transfer pathways, and the rates of these processes can be influenced by rational tuning of the reaction conditions. The characteristic reactive intermediates generated, however, are distinct and can exhibit very different reactivity patterns. This mechanistic diversity
ZnSe/ZnS core/shell quantumdots, surface-functionalized with electron or triplet-energy relay molecules, function as potent photosensitizers to address challenging organictransformations.