hydrogen; palladium on activated charcoal in methanol; chloroform T=20°C; 24 h;

<b>Multi-step reaction with 3 steps<br /> </b>1: 90 percent / Na / liquid ammonia / 2.5 h / -70 &deg;C<br />2: diphenylphosphoryl azide; Et₃N / benzene / 6 h / Heating<br />3: benzene / 30 h / Heating<br /> <br /> &nbsp;