Radical intermediates in the photolysis of the mixed benzoyl-substituted phosphonium-iodonium ylide in different solvents
摘要
Mixed phosphonium-iodonium ylides effectively undergo the photochemical reaction of heterocyclization. For most mixed phosphonium-iodonium ylides, the main stage of photolysis was the homolytic cleavage of the C—I bond of the ylide molecule with the formation of radicals. ESR spectroscopy was used to study radicals formed during the photolysis of the mixed benzoyl-substituted phosphonium-iodonium ylide in acetonitrile and alcohols. The hyperfine coupling constants of the registered radicals were determined and their structures were proposed.