1: 25 percent / lithium aluminium hydride / tetrahydrofuran / 4 h / Ambient temperature 2: boron trifluoride etherate / CDCl3 / 0.58 h / Ambient temperature 3: 52 percent / H2O; methanol 4: 7 percent / lithium, ethylamine, n-propylamine / 10 h / Ambient temperature View Scheme