route to β,γ-unsaturatedketones is disclosed. Aryl pentamethylcyclopentadienyl ketones underwent allylation with allyldimethylaluminum to yield the corresponding alcohols. Heating the alcohols in boiling toluene resulted in removal of pentamethylcyclopentadiene to provide β,γ-unsaturatedketones. The removal would proceed via a retro-carbonyl-ene process. Synthesis of an alkyl allyl ketone is also