Chemistry of Singlet Oxygen. Part 51. Zwitterionic Intermediates from 2,4-Hexadienes (I).

The three isomeric 2,4-hexadienes (I) give nearly identical product distributions with 1O2 ((IV) + (V) yield 3, 12, 12%; (VI) 4, 8, 11%; (VII) + (VIII) 11, 23, 25%, respectively).