triphenylphosphine; nickel dichloride; zinc in N,N-dimethyl-formamide T=75 - 80°C; 5 h;

<b>Multi-step reaction with 3 steps<br /> </b>1: 61 percent / NBS, AcOH / CHCl₃ / Ambient temperature<br />2: 66 percent / NiCl₂, Zn, Ph₃P / dimethylformamide / 5 h / 60 - 70 &deg;C<br />3: 51 percent / NBS, AcOH / CHCl₃ / Heating<br /> <br /> &nbsp;