1.1: BuLi / tetrahydrofuran; hexane / 0.25 h / -75 °C 1.2: ZnCl2 / tetrahydrofuran; hexane / -75 - 20 °C 1.3: [Pd(PPh3)4] / tetrahydrofuran; hexane / 20 h / Heating 2.1: aq. HCl / tetrahydrofuran / 7 h / 50 °C 3.1: 71 percent / aq. HBr / acetic acid / 5 h / Heating View Scheme