AlCl3, aluminium chloride in 1,4-dioxane T=20°C; 4 h;

1.1: NaH / tetrahydrofuran 1.2: 63 percent / tetrahydrofuran / 24 h / 60 °C 2.1: n-butyllithium / tetrahydrofuran; hexane / 0.33 h / 0 °C 2.2: 80 percent / tetrahydrofuran; hexane View Scheme