2: 74 percent / Zn powder, aq. 1N HCl, AcOH / 48 h / 0 °C 3: 1) 1N aq. LiOH, 2) Amberlite IR-120 / 1) THF, room temperature, 2) H2O, room temperature, 15 h View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1.1: oxalyl chloride / 3 h / 20 &deg;C<br />2.1: n-BuLi / toluene / 2 h / 0 - 20 &deg;C<br />2.2: 66 percent / toluene / 20 &deg;C<br /> <br /> &nbsp;