1: 83 percent / NaH / 1,2-dimethoxy-ethane / 2 h / Heating 2: 82 percent / H2, morpholine / 5 percent Rh/C / ethanol; methanol / 4 h / 18100.2 Torr / Ambient temperature 3: 81 percent / HCOONa / 3 h / Heating 4: K2CO3, Cu, CuBr / dimethylsulfoxide / 3 h / 160 °C 5: 5 N aq. NaOH / dimethylsulfoxide / 0.5 h / 75 °C View Scheme