1: 91 percent / zinc dust / diethyl ether; acetic acid / 5 h / Ambient temperature 2: 89 percent / thionyl chloride / 1) 1h room temperature 2) 1h 35-40 deg C 3: 1) pyridine 2) aq. NH3 / 1) toluene, 30 deg C 2) 0 deg C, 2d View Scheme