1: 41 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / benzene / 4 h / Heating 2: 93 percent / 28percent NH4OH / methanol / 48 h / 150 °C 3: 80 percent / sodium bis(2-methoxyethoxy)aluminium hydride / toluene / 0.5 h / Heating View Scheme