1: potassium hydroxide / ethanol / 1 h / Inert atmosphere; Cooling with ice 2: pyridine; acetic anhydride / 20 °C / Inert atmosphere 3: Rh2(esp)2 / toluene / 16 h / 75 °C / Inert atmosphere; Molecular sieve; Sealed tube View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1.1: sulfuric acid; potassium nitrate / 0 &deg;C / Inert atmosphere<br />2.1: iron; acetic acid / water; acetone / 8 h / Inert atmosphere; Reflux<br />3.1: sodium nitrite / water; acetic acid / 1 h / Inert atmosphere<br />3.2: 20 &deg;C / Inert atmosphere<br /> <br /> &nbsp;