1.1: titanium tetraethoxide / tetrahydrofuran / 24 h / 20 °C / |Inert atmosphere 2.1: lithium hexamethyldisilazane / tetrahydrofuran / 1 h / -78 °C / |Inert atmosphere 2.2: 2 h / -78 °C / |Inert atmosphere 3.1: lithium hexamethyldisilazane / N,N-dimethyl-formamide / 0.67 h / -15 °C / |Inert atmosphere 3.2: 2 h / -15 °C / |Inert atmosphere 4.1: diisobutylaluminium hydride / dichloromethane / 1 h / 0 °C / |Inert atmosphere 5.1: Dess-Martin periodane; sodium hydrogencarbonate / dichloromethane / 3 h / 0 - 20 °C / |Inert atmosphere 6.1: n-butyllithium / tetrahydrofuran; hexane / 0.67 h / -78 - 0 °C / |Inert atmosphere 6.2: 2 h / -78 - 20 °C / |Inert atmosphere 7.1: (SPY-5-31)-dichloro-(κ2(C,O)-(2-isopropyloxybenzylidene))(1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene)ruthenium / dichloromethane / 48 h / 20 °C / |Inert atmosphere 8.1: hydrogenchloride / methanol; water / 0 °C / |Inert atmosphere 9.1: sodium carbonate / ethanol / 24 h / 85 °C / |Inert atmosphere 10.1: potassium tert-butylate / tetrahydrofuran / 2 h / 0 °C / |Inert atmosphere 11.1: n-butyllithium; diisopropylamine / tetrahydrofuran; hexane / 1 h / -78 - 0 °C / |Inert atmosphere 11.2: 1 h / -78 °C / |Inert atmosphere View Scheme

1: indium tribromide / 4 h / 20 °C / Inert atmosphere 2: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / tetrachloromethane / 1 h / Reflux 3: anhydrous iron chloride / 1,2-dichloro-ethane / 4 h / 85 °C / Inert atmosphere View Scheme