1: 89 percent / magnesium / methanol / 4 h, 0 degC, 8 h, 25 degC 2: sodium periodate / H2O; methanol / 4 h 3: 1,2-dichloro-benzene / 4 h / Heating 4: 91 percent / potassium hydroxide / H2O; propan-2-ol / 24 h / Heating View Scheme