1: 72 percent / O2 / Pt / H2O / 20 h / 55 °C 2: 80 percent / phenol, 48percent HBr / 0.5 h / Heating View Scheme

<b>Multi-step reaction with 4 steps<br /> </b>1: 70 percent / NaCO₃ / H₂O / 4 h<br />2: 78 percent / 1.) n-BuLi / tetrahydrofuran / 1.) -78 degC, 2.) r.t., 40 h<br />3: 91 percent / BF₃*Et₂O / 20 h / Ambient temperature<br />4: 83 percent / W-2 Raney Ni / ethanol / 2 h / Heating<br /> <br /> &nbsp;