Journal of the Chemical Society. Perkin transactions II p. 513 - 518 (1992)
Update date:2022-07-30
Topics: Laser Flash Photolysis Quantum Yield Triplet State Radical intermediate Transient absorption spectroscopy α-Cleavage Photofragmentation SPIN TRAPPING EPR (Electron Paramagnetic Resonance)
Leopold, Detlev
Fischer, Hanns
Free radical reactions induced by photolysis of 2,2-dialkyl-2-aminoacetophenone photocuring agents have been studied by continuous wave (CW) and time-resolved EPR spectroscopy.In all solvents α-cleavage from the triplet state is the major process.In hydrogen donor solvents it is accompanied by photoreduction followed by a rapid amine elimination from the ketyl radical intermediate.The benzoyl and α-aminoalkyl radicals resulting from α-cleavage readily add to acrylonitrile whereas radicals formed by photoreduction do not.
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