Model studies have been conducted to test several features of spirocyclization methodologies based upon excited-state reactions of allyliminium salts. Results from investigations of the photocyclization reactions of the P-enaminone-derived prenyliminium perchlorates 4-8 suggest that spirocyclic amine forming reactions, induced by intramolecular electron transfer and leading to 2-aza-l, 5-diradicah by methanol addition to precursor ...
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