1.1: magnesium / tetrahydrofuran / 0.5 h / 20 - 25 °C / Inert atmosphere 1.2: 1 h / Inert atmosphere 2.1: pyridinium p-toluenesulfonate / dichloromethane / 0.5 h / 20 °C / Inert atmosphere 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 5 h / 0 - 20 °C / Inert atmosphere 4.1: triphenylphosphine; diethylazodicarboxylate / diethyl ether; benzene / 14 h / 20 °C 5.1: pyridinium p-toluenesulfonate / ethanol / 1 h / 60 °C 6.1: RuCl2(tricyclohexylphosphine)2(benzylidene) / toluene / 23 h / 80 °C / Inert atmosphere 7.1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / dichloromethane; dimethyl sulfoxide / 0.5 h / 20 °C / Inert atmosphere 8.1: aluminium(III) iodide; tetra-(n-butyl)ammonium iodide / benzene / 10 °C View Scheme