1.1: n-butyllithium / hexanes; diethyl ether / 1.17 h / -78 °C / Inert atmosphere 1.2: 4 h / -78 - 20 °C / Inert atmosphere 2.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 0 °C / Inert atmosphere; Darkness 2.2: 1 h / 20 °C / Inert atmosphere; Darkness 3.1: chloro-trimethyl-silane; water / methanol / 0.17 h View Scheme