1: NaBH4 / 1) EtOH, 2 h, 2) r.t., 2 h 2: 50 percent / Fe (powder) / acetic acid / 18 h / 50 - 55 °C 3: 40 percent / Zn (powder) / 2 h / Heating View Scheme

sodium tetrahydroborate in ethanol 5 h; Yield given;

sodium tetrahydroborate 1) EtOH, 2 h, 2) r.t., 2 h; Yield given. Multistep reaction. Yields of byproduct given;