1.1: sec.-butyllithium / diethyl ether; cyclohexane; hexane / 1 h / -78 °C / |Inert atmosphere; |Schlenk technique 1.2: 2 h / -78 °C / |Inert atmosphere; |Schlenk technique 1.3: 16.08 h / -78 - 20 °C / |Inert atmosphere; |Schlenk technique 2.1: tetrabutyl ammonium fluoride; water / toluene / 1.5 h / 20 °C 3.1: osmium(VIII) oxide; sodium periodate 4.1: sodium tris(acetoxy)borohydride / tetrahydrofuran / 18 h / 20 °C / |Inert atmosphere 5.1: hydrogen bromide; acetic acid View Scheme