1.1: triethylamine / dichloromethane / 96 h / |Reflux 2.1: lithium diisopropyl amide / tetrahydrofuran / 1 h / -78 °C 2.2: 3 h / 20 °C 3.1: Grubb's 2nd generation catalyst / dichloromethane / 2 h / 45 °C / |Inert atmosphere; |Sealed tube 4.1: lithium diisopropyl amide / tetrahydrofuran / 1 h / -78 °C View Scheme