Influence of electron-donor sensitizers on SET-promoted photochemical reactions of β,γ-unsaturated aldehydes

[GRAPHICS] beta,gamma-Unsaturated aldehydes undergo photochemical oxa-di-pi-methane and decarbonylation reactions using DMN as an electron-donor sensitizer, whereas, using DMA, other photoproducts resulting from proton abstraction by ketyl- and alkene-centered radical-anions are also obtained.