tetrabutylammomium bromide Yield given;

<b>Multi-step reaction with 2 steps<br /> </b>1: Br₂ / 1.) 60 deg C, 1 h, 2.) 90 deg C, 1 h<br />2: ethanol / 1.) 50 deg C, 2 h, 2.) reflux, overnight<br /> <br /> &nbsp;