1.1: BuLi / hexane; tetrahydrofuran / 1 h / -78 °C 1.2: 75 percent / 1,2-diiodoethane / hexane; tetrahydrofuran / -78 - 20 °C 2.1: Bu3SnH; AIBN / benzene / 6 h / 80 °C 2.2: 75 percent / aq. KF / tetrahydrofuran / 2 h View Scheme

1.1: BuLi / hexane; tetrahydrofuran / 1 h / -78 °C 1.2: 75 percent / 1,2-diiodoethane / hexane; tetrahydrofuran / -78 - 20 °C 2.1: 91 percent / TsOH / methanol / 2 h / 20 °C 3.1: Ellman resin; TsOH / CH2Cl2 / 72 h / 20 °C 3.2: hexamethylditin / benzene / 20 h / 80 °C / UV-irradiation 3.3: TsOH / CH2Cl2; methanol / 10 h / 20 °C View Scheme

1.1: BuLi / hexane; tetrahydrofuran / 1 h / -78 °C 1.2: 75 percent / 1,2-diiodoethane / hexane; tetrahydrofuran / -78 - 20 °C 2.1: Bu3SnH; AIBN / benzene / 6 h / 80 °C 2.2: aq. KF / tetrahydrofuran / 2 h View Scheme