1: 91 percent / 90 percent H2SO4 / 2 h / Ambient temperature 2: 76 percent / PCl3 / CHCl3 / 1 h / Ambient temperature View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 96 percent / 30 percent H₂O₂ / acetic anhydride / 50 h / Ambient temperature<br />2: 77 percent / HNO₃ (d=1.49) / 0.58 h / -3 - 0 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 82 percent / pyridine / 0 - 5 &deg;C<br />2: 96 percent / 30 percent H₂O₂ / acetic anhydride / 50 h / Ambient temperature<br />3: 77 percent / HNO₃ (d=1.49) / 0.58 h / -3 - 0 &deg;C<br /> <br /> &nbsp;