1.1: n-butyllithium / tetrahydrofuran / -78 °C 1.2: 20 °C 2.1: tetrahydrofuran; hexane / 0.17 h / 0 - 20 °C / |Inert atmosphere 2.2: 2 h / |Reflux; |Inert atmosphere 3.1: tetrahydrofuran; hexane / 0.17 h / -78 °C / |Inert atmosphere 4.1: tetrahydrofuran; hexane / 0.5 h / |Inert atmosphere 5.1: Cl2Ni(1,2-bis(diphenylphosphino)ethane) / tetrahydrofuran / 5 h / |Inert atmosphere; |Reflux 6.1: water; hydrogenchloride / 3 h / |Reflux View Scheme

1.1: n-butyllithium / tetrahydrofuran / -78 °C 1.2: 20 °C 2.1: tetrahydrofuran; hexane / 0.17 h / 0 - 20 °C / |Inert atmosphere 2.2: 2 h / |Reflux; |Inert atmosphere 3.1: tetrahydrofuran; hexane / 0.17 h / -78 °C / |Inert atmosphere 4.1: tetrahydrofuran; hexane / 0.5 h / |Inert atmosphere 5.1: Cl2Ni(1,2-bis(diphenylphosphino)ethane) / tetrahydrofuran / 2.5 h / |Inert atmosphere; |Reflux View Scheme