potassium hydroxide in water; isopropyl alcohol 18 h; Heating;

With  lead(IV) acetate; iodine; calcium carbonate in  benzene 2 h;  Heating;   

Multi-step reaction with 2 steps 1: 50 percent / aq. KOH / ethanol; H2O / 70 h / 25 °C2: 35 percent / iodosobenzene diacetate, CaCO3, I2 / benzene / 2.5 h / Heating  

Multi-step reaction with 3 steps 1: 81 percent / zinc, acetic acid / methanol / 17 h / 25 °C2: 76 percent / platinum oxide, NaNO2, H2 / ethanol / 2.5 h / 2068.6 Torr3: 49 percent / lead tetraacetate, CaCO3, I2 / benzene / 2.5 h / Heating