1: aq. NH3 2: SOCl2 / benzene View Scheme

ammonium hydroxide

<b>Multi-step reaction with 5 steps<br /> </b>1: piperidine / 72 h / 30 - 40 &deg;C<br />2: KOH / ethanol / Heating<br />3: polyphosphoric acid / Heating<br />4: zinc amalgam, aq. HCl / benzene / Heating<br />5: 87.4 percent / SOCl₂ / benzene / 0.75 h / Heating<br /> <br /> &nbsp;