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À propos de : Involvement of Triplet Excited States and Olefin Radical Cationsin Electron-Transfer Cycloreversion of Four-Membered RingCompounds Photosensitized by (Thia)pyrylium Salts        

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  • Involvement of Triplet Excited States and Olefin Radical Cationsin Electron-Transfer Cycloreversion of Four-Membered RingCompounds Photosensitized by (Thia)pyrylium Salts
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  • Cycloreversion of 1,2,3,4-tetraphenylcyclobutanes 1a,b and oxetane 2 is achieved using (thia)pyrylium salts as electron-transfer photosensitizers. Radical cation intermediates involved in theelectron-transfer process have been detected using laser flash photolysis. The experimental resultsare consistent with the reaction taking place from the triplet excited state of the sensitizer.
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