1.1: sodium hydride / mineral oil; tetrahydrofuran / 0.5 h / 0 °C / |Inert atmosphere; |Schlenk technique 1.2: 1 h / 20 °C / |Inert atmosphere; |Schlenk technique 2.1: n-butyllithium / hexane; tetrahydrofuran / 0.5 h / -78 °C / |Inert atmosphere; |Schlenk technique 3.1: lithium aluminium tetrahydride / tetrahydrofuran / 0 - 20 °C / |Inert atmosphere; |Schlenk technique 4.1: air / chloroform-d1 View Scheme