dicyclohexyl-carbodiimide; copper dichloride in toluene 6 h; Heating;

1: n-BuLi / tetrahydrofuran; hexane / 0.17 h / -70 °C 2: tetrahydrofuran; hexane / -70 °C 3: 30 percent / dicyclohexylcarbodiimide, CuCl2 / toluene / 6 h / Heating View Scheme

1: tetrahydrofuran; hexane / -70 °C 2: 30 percent / dicyclohexylcarbodiimide, CuCl2 / toluene / 6 h / Heating View Scheme

Inert atmosphereReflux;