TEMPO as a Hydrogen Atom Transfer Catalyst for Aerobic Dehydrogenation of Activated Alkanes to Alkenes
Tasuku Ito, Falk William Seidel, Xiongjie Jin, Kyoko Nozaki
Abstract
-oxyl (TEMPO) has been extensively utilized as a radical scavenger or an oxidation catalyst. In contrast, TEMPO as a hydrogen atom transfer (HAT) catalyst has rarely been studied. Here, we report that TEMPO, as the HAT catalyst, homolytically cleaves benzylic or allylic C-H bonds to give the corresponding alkyl radicals. Benefiting from the dual roles played by TEMPO as the HAT catalyst and the radical scavenger, the highly challenging aerobic dehydrogenation of activated alkanes to alkenes is successfully developed.
Topics & Concepts
DehydrogenationCatalysisChemistryScavengerHydrogen atomAllylic rearrangementRadicalPhotochemistryAlkylMedicinal chemistryHydrogenOrganic chemistryOxidative Organic Chemistry ReactionsRadical Photochemical ReactionsSynthesis and Catalytic Reactions