tetracarbonylbis(μ-chloro)dirhodium(I) in 1,4-dioxane T=90°C; 6 h;

1: 85 percent / t-BuLi / tetrahydrofuran; diethyl ether; pentane / -100 - 20 °C 2: 78 percent / [RhCl(CO)2]2 / dioxane / 6 h / 90 °C View Scheme