ChemInform Abstract: Electron Transfer Photofragmentations of 3-Phenylpropiophenones

Photolysis of 3-phenylpropiophenones1 a–d in the presence of 2,4,6-triphenylpyrylium tetrafluoroborate (TPT) yields the corresponding α,β-unsaturated ketones2 a–c and1 d (from1 c), together with acetophenone (3), benzophenone (4), benzoic acid (5) and benzaldehyde (6), presumably by fragmentations of the radical cation1+ ·, generated via a single electron transfer process from1 to the excitedTPT.