Reaction type Comment Pathway Carbene insertion Rh 2 -catalyzed. Sterics dominate? Hydride H abstraction C-N Amination Rh 2 (esp) 2 -catalyzed. Complex mechanism. Sterics dominate? Unknown Azidation Fe-catalyzed suggest radical but radial clock hampered by low reactivity. Radical Oxidation 𝛼 cyanation Tropylium mediated. Hydride oxidative Mannich Several pathways but evidence for hydride transfer. Hydride Oxyfunctionalization Radical, biradical, or hydride transfer. Depends on the substrate. Unknown H abstraction C-X Mn(Salen)OTf catalysed Radical Oxidative degradation Reaction with O 2 or P450. Radical H abstraction C-C Photoredox minisci-like, HAT and SET pathways. Radical Miscellaneous Review on hydride abstraction reactions. Hydride