Abstract
The photoreactions of triallylamine and triethylamine with a variety of triplet sensitizers containing carbonyl functions were studied in acetonitrile-d 3 by using pseudo-steady-state measurements of chemically induced dynamic nuclear polarization (CIDNP). These reactions are hydrogen abstractions formally, but they are known to proceed in two steps: electron transfer from the amine to the excited sensitizer, followed by deprotonation of the resulting aminium cation to give an α-aminoalkyl radical. From the CIDNP intensity patterns in the reaction products, we determined the intermediates (radical ion pairs or pairs of neutral radicals) that give rise to the observed polarizations
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