iodine T=40 - 100°C; P=15 Torr; 0.5 h;

toluene-4-sulfonic acid in benzene 24 h; Heating; Yield given. Yields of byproduct given. Title compound not separated from byproducts;

<b>Multi-step reaction with 2 steps<br /> </b>1: 92 percent / Li / tetrahydrofuran / 1.) 10-15 deg C, 2.) r.t., 1 h<br />2: 80 percent / 1 M aq. HCl / tetrahydrofuran / 0.08 h / Ambient temperature<br /> <br /> &nbsp;