Acid-Catalyzed Rearrangement of an Allene-Cyclohexenone Photoadduct and its Application in the Synthesis of (±)-Pentalenene - Morimoto, Tsumoru; Horiguchi, Tomoyuki; Yamada, Kuriko; Tsutsumi, Ken; Kurosawa, Hideo; Kakiuchi, Kiyomi (Synthesis, 2004)