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1992•Journal of the Chemical Society Perkin Transactions 2Requires access

EPR studies on the photofragmentation of 2,2-dialkyl-2-alkylaminoacetophenones

Detlev Leopold, Hanns Fischer

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Abstract

Free radical reactions induced by photolysis of 2,2-dialkyl-2-alkylaminoacetophenone 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 inter-mediate. 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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Free radical reactions induced by photolysis of 2,2-dialkyl-2-alkylaminoacetophenone 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 inter-mediate. 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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Available abstract

Free radical reactions induced by photolysis of 2,2-dialkyl-2-alkylaminoacetophenone 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 inter-mediate. The benzoyl and α-aminoalkyl radicals resulting from α-cleavage readily add to acrylonitrile whereas radicals formed by photoreduction do not.

Key concepts: Radical, Chemistry, Ketyl, Photochemistry, Electron paramagnetic resonance, Acrylonitrile, Photodissociation, Amine gas treating

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