Photolysis of N-(2,6-dichlorobenzyl)-3-(o-formylbenzoyl)-1,4-dihydropyridine (1) gave the corresponding pyridinium alcohol; deuterium labelling showed the process to be intramolecular and to involve the transfer from C-4 of the dihydropyridine to the formyl carbon atom.
J. D. Sammes and D. A. Widdowson, J. Chem. Soc., Chem. Commun., 1972, 1023 DOI: 10.1039/C39720001023
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