1: 89 percent / tetrahydrofuran / -78 deg C warmed up to -20 deg C 2: 86 percent / LiHBEt3 / PdCl2(dppp) (5 mol percent) / tetrahydrofuran / 2 h / 0 °C 3: 2.) Ag2O / 1.) cc. HCl / 1.) MeOH, CHCl3, stirring overnight: 2.) hexane, R.T. 30 min View Scheme