1.1: PPh3 / tetrahydrofuran / 15 h / 20 °C 1.2: 63 percent / H2O / tetrahydrofuran / 3 h / 20 °C 2.1: N,N'-bis(2,6-diisopropylphenyl)dihydroimidazol-2-ylidene*HCl; NaH; t-BuOH / Pd(OAc)2 / dioxane / 4 h View Scheme

1: With triphenylphosphine in tetrahydrofuran T=20°C; 15 h; 2: With water in tetrahydrofuran T=20°C; 3 h;