Synthesis of β,γ-Unsaturated Ketones by Allylation of Pentamethylcyclopentadienyl Ketones Followed by Removal of Pentamethylcyclopentadiene - Iwasaki, Masayuki; Morita, Eiji; Uemura, Minoru; Yorimitsu, Hideki; Oshima, Koichiro (Synlett, 2007)