1.1: 73 percent / benzyltrimethylammonium tribromide / CH2Cl2; methanol / 1 h / 20 °C 2.1: 94 percent / n-BuLi / hexane; tetrahydrofuran / 24 h / 20 °C 3.1: n-BuLi / tetrahydrofuran; hexane / 5 h / -78 °C 3.2: hexane; tetrahydrofuran / 1 h / -50 °C 3.3: 70 percent / HCl / tetrahydrofuran; hexane / 0.17 h / 20 °C 4.1: 81 percent / n-BuLi / hexane; tetrahydrofuran / 24 h / 20 °C 5.1: 100 percent / (N,N'-Mes2-2,3-dihydroimidazol-2-yl)Ru=CHPh(PCy3)Cl2 / CH2Cl2 / 2 h / 40 °C View Scheme