Involvement of triplet excited states and olefin radical cations in electron-transfer cycloreversion of four-membered ring compounds photosensitized by (thia)pyrylium salts.

@article{Miranda2002InvolvementOT,
  title={Involvement of triplet excited states and olefin radical cations in electron-transfer cycloreversion of four-membered ring compounds photosensitized by (thia)pyrylium salts.},
  author={Miguel A Miranda and Maria Angeles Izquierdo and Francisco Galindo},
  journal={The Journal of organic chemistry},
  year={2002},
  volume={67 12},
  pages={4138-42}
}
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 the electron-transfer process have been detected using laser flash photolysis. The experimental results are consistent with the reaction taking place from the triplet… CONTINUE READING