hydrogen; palladium dihydroxide in ethanol; water

<b>Multi-step reaction with 3 steps<br /> </b>1: 402 mg / triethylamine / ethanol / 48 h<br />2: KHMDS<br />3: 48 percent / aq. HClO₄ / 15 h / 80 &deg;C<br /> <br /> &nbsp;