1: 100 percent / H2 / Pd/C / methanol / 24 h / 20 °C / 3361.46 Torr 2: 100 percent / KOH / methanol / 12 h / Heating 3: 82 percent / BBr3 / CH2Cl2 / -78 - 20 °C View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1.1: 98 percent / K₂CO₃ / acetone / 6 h / Heating<br />2.1: n-BuLi / tetrahydrofuran / 0.75 h / -78 &deg;C<br />2.2: 75 percent / tetrahydrofuran / 0.5 h / -78 &deg;C<br /> <br /> &nbsp;