Highly Regioselective Alkylation at the More Hindered γ-Site of Unsymmetrical Ketones by Use of Their Potassium Enolates. A Comparative Study with Lithium Enolates - Quesnel, Yannick; Bidois-Sery, Laure; Poirier, Jean-Marie; Duhamel, Lucette (Synlett, 1998)