1: 70 percent / 85 percent phosphoric acid / 1.42 h / 100 - 170 °C / 20 - 40 Torr 2: 93 percent / LiAlH4 / diethyl ether / 22 h / Heating 3: 48 percent aq. HBr, conc. sulfuric acid / 48 h / 25 °C 4: 58 percent / quinoline / 150 - 195 °C View Scheme