1: CuBr*Me2S / diethyl ether / Ambient temperature; or Cu(I)-pentin-1-ide 2: 480 mg / Ce(NH4)2(NO3)6 / acetonitrile; H2O / 1 h / Ambient temperature View Scheme

1: CuBr*Me2S / diethyl ether / Ambient temperature; or Cu(I)-pentin-1-ide 2: 480 mg / Ce(NH4)2(NO3)6 / acetonitrile; H2O / 1 h / Ambient temperature 3: 1) H2, 2) conc. HCl / 1) 10percent Pd/C / 1) MeOH, 760 Torr, 2) 50 deg C, 2h View Scheme