thionyl chloride T=60°C; 3 h;

<b>Multi-step reaction with 3 steps<br /> </b>1: toluene / Heating<br />2: 43 percent / PPA / 15 h / 120 &deg;C<br />3: 1.) SeO₂; 2.) Ag₂O, NaOH / 1.) dioxane, reflux, 6 h; 2.) 60 deg C<br /> <br /> &nbsp;