2: 230 °C View Scheme

(i) (saponification), (ii) (decarboxylation), (iii) SOCl2; Multistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: ethanol<br />2: sodium ethylate; ethanol; benzene<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1.1: sodium hydride / DMFA / 0.5 h / 20 &deg;C / |Inert atmosphere<br />1.2: 5 h / 50 &deg;C / |Inert atmosphere<br />2.1: Grubb's 2nd generation catalyst / dichloromethane / 1 h / 40 &deg;C / |Inert atmosphere<br />3.1: Grubb's 2nd generation catalyst; formic acid; sodium formate / tetrahydrofuran / 6 h / 80 &deg;C / |Inert atmosphere<br /> <br /> &nbsp;