1.1: n-butyllithium / tetrahydrofuran; hexane / -78 °C 1.2: -78 °C 1.3: 12 h / -78 - 20 °C 2.1: RuCl2(tricyclohexylphosphine)2(benzylidene) / dichloromethane / 12 h / 20 °C 3.1: iodine; sodium hydrogencarbonate / dichloromethane / 12 h / 20 °C View Scheme