A New Type of Photorearrangement of γ-Hydroxy-α, β, δ, ε-dienone

A new type of photorearrangement of the γ-hydroxy-α, β, δ, ε-dienone, vomifoliol acetate ( 2 ) to the diketone 4 is described, and its facile rearrangement is compared with that of desoxyvomifoliol acetate ( 3 ).