Radical Intermediates in Reactions of Mixed Phosphonium–Iodonium Ylides

The active intermediates generated in the photolysis of phosphonium–iodonium ylides and their reaction with acetylenes have been studied with electron and nuclear magnetic resonance spectroscopy. The radical mechanism of the ylides decomposition and of the interaction with acetylenes has been established using a stable nitroxyl radical. The radical products of these reactions have been monitored for the first time by EPR, and their spectroscopic parameters were determined. The chemical structure of the active intermediates of the reactions under study has been proposed.