tetrabutyl ammonium fluoride in tetrahydrofuran 3 h; Ambient temperature;

<b>Multi-step reaction with 2 steps<br /> </b>1: ammonium sulfate / 24 h / Heating<br />2: 90 percent / dibenzo-18-crown-6 ether, KI / acetonitrile; toluene / 2 h / 80 &deg;C / solid-liquid phase transfer catalysis<br /> <br /> &nbsp;

<b>Multi-step reaction with 4 steps<br /> </b>1: pyridine / 1 h / Ambient temperature<br />2: 73 percent / P₂O₅ / CHCl₃ / 24 h / Ambient temperature<br />3: 95 percent / BF₃*Et₂O / diethyl ether / 48 h / 4 &deg;C<br />4: 90 percent / dibenzo-18-crown-6 ether, KI / acetonitrile; toluene / 2 h / 80 &deg;C / solid-liquid phase transfer catalysis<br /> <br /> &nbsp;