1: 93.7 percent / L-Selectride / tetrahydrofuran / 3 h / -78 °C 2: 92.4 percent / pyridine / Ambient temperature 3: 81.9 percent / potassium t-butoxide / 2-methyl-propan-2-ol / 1 h / 40 °C 4: H2 / PtO2 / diethyl ether / 760 Torr / Ambient temperature View Scheme