triphenylphosphine; lithium chloride; palladium diacetate in N,N-dimethyl-formamide T=65°C; Stille coupling; 3 h;

1.1: n-BuLi; HMDS / tetrahydrofuran; hexane / 0.17 h / -78 °C 1.2: 62 percent / tetrahydrofuran; hexane / 25.5 h / -78 - 20 °C 2.1: PPh3; LiCl / Pd(OAc)2 / dimethylformamide / 3 h / 65 °C View Scheme