1: cyclohexane / 2 h / Heating 2: 50percent acetic acid / tetrahydrofuran / 8 h View Scheme

<b>Multi-step reaction with 4 steps<br /> </b>1: 90 percent / K₂CO₃ / butan-2-one / 24 h / Heating<br />2: 92 percent / KOH / aq. ethanol / 12 h / Heating<br />3: oxalyl chloride, pyridine / benzene / 5 h / Heating<br />4: NaN₃ / acetonitrile<br /> <br /> &nbsp;