1.1: t-BuLi / diethyl ether; pentane / 0.5 h / -78 °C 1.2: ZnBr2 / tetrahydrofuran; diethyl ether; pentane / -78 - -10 °C 1.3: 75 percent / Et3N / (Ph3P)4Pd / tetrahydrofuran; diethyl ether; pentane / -40 - 20 °C 2.1: 95 percent / n-Bu4NF / tetrahydrofuran / 2 h / 20 °C View Scheme