1: 54 percent / ethanol / 2 h / Heating 2: 80 percent / diethyl ether; ethyl acetate / 0.5 h 3: C2H5ONa / EtOH, 1.) ice-cooling, 30 min, 2.) 20 h, reflux View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 1) Na / 1) ether, methanol room temperature, 1 d; 2) reflux, 3 h;<br />2: 52 percent / diethyl ether / 1 h / 0 &deg;C<br /> <br /> &nbsp;