Photochemistry of .beta.,.gamma.-enones. 7. Intramolecular competition between di-.pi.-methane and oxa-di-.pi.-methane rearrangements. On the intermediary of charge-transfer complexes and zwitterions in the di-.pi.-methane rearrangements
Photochemistry of .beta.,.gamma.-enones. 7. Intramolecular competition between di-.pi.-methane and oxa-di-.pi.-methane rearrangements. On the intermediary of charge-transfer complexes and zwitterions in the di-.pi.-methane rearrangements