1: 43 percent / Na / toluene; propan-2-ol / 4 h / Heating 2: 93 percent / H2 / 5percent Pd/C / diethyl ether 3: Et3SiH, BF3 / CH2Cl2 / 0.08 h / Ambient temperature View Scheme

1: 25percent KOH, N2H4*H2O / various solvent(s) / 18 h / 120 °C 2: various solvent(s) / 6 h / 150 deg C up to 200 deg C 3: H2 / Pd/C / diethyl ether / 2 h / Ambient temperature View Scheme