Enantiopure Acetals of α-Alkynyl Carbonyl Compounds: Organoaluminum-Mediated 1,2-Shift of Cobalt-Complexed Alkynyl Group with Concomitant Capture by a Nucleophile - Taya, Kimiko; Nagasawa, Tetsuya; Suzuki, Keisuke (Synlett, 1997)