1: hydrogen / Pd/C / methanol / 4 h / 775.74 Torr 2: 98 percent / pyridine; toluene / 1 h / Heating 3: 67 percent / Lawesson's reagent / toluene / 2 h / Heating 4: 70 percent / sodium hydride; iodine / benzene / 2 h / Heating View Scheme

lithium chloride in N,N-dimethyl-formamide 24 h; Heating;

palladium 10 on activated carbon; hydrogen in ethanol P=2068.65 Torr; 2 h;