Eosine‐sensitized photooxidation of the cyclic N‐aryl‐enamines 1, 6 and 8 results in oxidative splitting of enamine double bonds. Thereby compounds 2, 7 and 9 respectively are formed. From a mixture of the tautomeric quinoline derivatives 12 and 13, on oxidation under similar conditions, the compounds 7, 14 and 16 were isolated.
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Pfoertner et al. (1968) studied this question.