1: 72 percent / Mn(OAc)2, O2, AcOH / 23 °C 2: 32 percent / HClO4 / acetonitrile / 0.25 h / Heating View Scheme

1: tetrabutylammomium bromide; dihydrogen peroxide; sodium hydroxide / dichloromethane; water / 0 °C 2: (Ph3P)AuCl; silver trifluoromethanesulfonate / dichloromethane / 0.08 h / 20 °C View Scheme

1: bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; diisopropylamine / tetrahydrofuran / 0.67 h / 0 °C / |Inert atmosphere 2: tetrabutylammomium bromide; dihydrogen peroxide; sodium hydroxide / dichloromethane; water / 0 °C 3: (Ph3P)AuCl; silver trifluoromethanesulfonate / dichloromethane / 0.08 h / 20 °C View Scheme

1: bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; diisopropylamine / tetrahydrofuran / 0.67 h / 0 °C / |Inert atmosphere 2: tetrabutylammomium bromide; dihydrogen peroxide; sodium hydroxide / dichloromethane; water / 0 °C 3: (Ph3P)AuCl; silver trifluoromethanesulfonate / dichloromethane / 0.08 h / 20 °C View Scheme

1: 82 percent / NaBH4 / methanol / 25 °C 2: NaN3 / dimethylformamide / 3 h / 60 °C View Scheme

1: KOH 2: H2SO4 View Scheme

1: tetrabutylammomium bromide; dihydrogen peroxide; sodium hydroxide / dichloromethane; water / 0 °C 2: silver trifluoromethanesulfonate; methanol; {1,3-bis[2,6-di(propan-2-yl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene}AuCl; toluene-4-sulfonic acid / dichloromethane-d2 / 0.17 h / 20 °C View Scheme

1: bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; diisopropylamine / tetrahydrofuran / 0.67 h / 0 °C / |Inert atmosphere 2: tetrabutylammomium bromide; dihydrogen peroxide; sodium hydroxide / dichloromethane; water / 0 °C 3: silver trifluoromethanesulfonate; methanol; {1,3-bis[2,6-di(propan-2-yl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene}AuCl; toluene-4-sulfonic acid / dichloromethane-d2 / 0.17 h / 20 °C View Scheme

1: bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide; diisopropylamine / tetrahydrofuran / 0.67 h / 0 °C / |Inert atmosphere 2: tetrabutylammomium bromide; dihydrogen peroxide; sodium hydroxide / dichloromethane; water / 0 °C 3: silver trifluoromethanesulfonate; methanol; {1,3-bis[2,6-di(propan-2-yl)phenyl]-1,3-dihydro-2H-imidazol-2-ylidene}AuCl; toluene-4-sulfonic acid / dichloromethane-d2 / 0.17 h / 20 °C View Scheme