Intramolecular [2 + 2] photocycloadditions of E and Z olefins to cyclohex-2-enone
Abstract
The [2 + 2] intramolecular photocycloaddition of E and Z olefins to a cyclohexenone has been investigated; it is concluded that the bond to C(3) in the cyclohexenone is formed first to give the diradical intermediates (7a) and (7b).