iodine; sodium hydride in benzene 2 h; Heating;

<b>Multi-step reaction with 4 steps<br /> </b>1: 82 percent / potassium carbonate / acetone / 4 h / Heating<br />2: hydrogen / Pd/C / methanol / 4 h / 775.74 Torr<br />3: 98 percent / pyridine; toluene / 1 h / Heating<br />4: 67 percent / Lawesson's reagent / toluene / 2 h / Heating<br /> <br /> &nbsp;