Unusually High Reactivity of the C-Si Bond in the Lewis Acid Mediated Reactions of (E)-1-(Trimethylsilyl)-2-(isopropylthio)ethylene with Carbonyl Electrophiles - Bonini, Bianca F; Comes-Franchini, Mauro; Fochi, Mariafrancesca; Mazzanti, Germana; Ricci, Alfredo (Synlett, 1997)