1: KOH, N2H4*H2O / ethane-1,2-diol / 160 - 200 °C 2: Se / 300 - 320 °C View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1: (i) SOCl₂, (ii) AlCl₃ <br />2: (i) Zn, I₂, (ii) HCO₂H, (iii) aq. KOH<br />3: (i) PCl₅, (ii) SnCl₄ <br /> <br /> &nbsp;