1: 96 percent / lithium aluminium hydride / diethyl ether / 20 h / Ambient temperature 2: 93 percent / thionyl chloride, pyridine / 1.) room temperature, 21 h, 2.) reflux, 1 h 3: 57 percent / 650 °C / 0.01 Torr 4: 7 percent / lithium, ethylamine, n-propylamine / 10 h / Ambient temperature View Scheme