hydrogen; palladium on activated charcoal in cyclohexane Ambient temperature;

triethylsilane; Re2O7 in dichloromethane T=20°C; 96 h; Inert atmosphere;

1: triethylamine / dichloromethane / 20 °C 2: pyridinium p-toluenesulfonate / methanol / 20 °C 3: Au[P(t-Bu)2(o-biphenyl)][CH3CN]SbF6 / dichloromethane / 20 °C / Molecular sieve; Inert atmosphere View Scheme

1: n-butyllithium / tetrahydrofuran / -78 °C 2: lithium aluminium tetrahydride / tetrahydrofuran / 50 °C 3: Au[P(t-Bu)2(o-biphenyl)][CH3CN]SbF6 / dichloromethane / 20 °C / Molecular sieve; Inert atmosphere View Scheme

1: 88 percent 2: 67 percent / (NH4)2Ce(NO3)6 / acetonitrile; H2O View Scheme

1: pyridinium chlorochromate / dichloromethane / |Inert atmosphere 2: (SPY-5-31)-dichloro-(κ2(C,O)-(2-isopropyloxybenzylidene))(1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene)ruthenium / dichloromethane / |Inert atmosphere; |Reflux 3: pyridinium p-toluenesulfonate / methanol / 50 °C / |Inert atmosphere 4: diisobutylaluminium hydride / dichloromethane / -78 °C / |Inert atmosphere 5: water; acetic acid / 20 °C / |Inert atmosphere 6: Re2O7; triethylsilane / dichloromethane / 96 h / 20 °C / |Inert atmosphere View Scheme

1: (SPY-5-31)-dichloro-(κ2(C,O)-(2-isopropyloxybenzylidene))(1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene)ruthenium / dichloromethane / |Inert atmosphere; |Reflux 2: pyridinium p-toluenesulfonate / methanol / 50 °C / |Inert atmosphere 3: diisobutylaluminium hydride / dichloromethane / -78 °C / |Inert atmosphere 4: water; acetic acid / 20 °C / |Inert atmosphere 5: Re2O7; triethylsilane / dichloromethane / 96 h / 20 °C / |Inert atmosphere View Scheme

1: pyridinium p-toluenesulfonate / methanol / 50 °C / |Inert atmosphere 2: diisobutylaluminium hydride / dichloromethane / -78 °C / |Inert atmosphere 3: water; acetic acid / 20 °C / |Inert atmosphere 4: Re2O7; triethylsilane / dichloromethane / 96 h / 20 °C / |Inert atmosphere View Scheme