TEMPO-promoted Pauson-Khand reaction. Single-electron activation of cobalt carbonyl bonds?
A. Lagunas, A. Mairata i Payeras, C. Jimeno, M. A. Pericàs
Org. Lett. 2005, 7, 3033-3036
Abstract: The Pauson-Khand reaction is notably accelerated by TEMPO. According to DFT calculations, TEMPO could trigger a radical, low-energy pathway for the reaction by facilitating the decarbonylation of doublet complexes arising either from a CO/nitroxide exchange or from nitroxide addition to a CO ligand.