1: 91 percent / MnO2 / CHCl3 / 3 h / Heating 2: 90 percent / 0.33 h / 220 °C 3: 100 percent / HCl / methanol View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1: 83 percent / 1,2,3,4-tetrahydro-naphthalene / 0.67 h / Heating; azeotropic distillation<br />2: 68 percent / POCl₃ / benzene / 0.5 h / Heating<br />3: 94 percent / MnO₂ / CHCl₃ / 3 h / Ambient temperature<br /> <br /> &nbsp;