1: Ph3P / CCl4 / 3 h / Heating; var. reag.: Me3SiI 2: 1) Me3SiI, 2) MeOH / 1)CDCl3, 6 d 3: 20 percent / Raney Ni / acetone View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: methanol / 3 h / Ambient temperature<br />2: 60 percent / n-BuLi / tetrahydrofuran / 2 h / 65 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 1) Me₃SiI, 2) MeOH / 1)CDCl₃, 6 d<br />2: 24 percent / Raney Ni / acetone<br />3: 60 percent / n-BuLi / tetrahydrofuran / 2 h / 65 &deg;C<br /> <br /> &nbsp;