Making 1,3,5-Tribromobenzene from Phenol
First react phenol with ammonia in presence of zinc chloride to obtain aniline.





Then react aniline with bromine water to form 1,3,5-tribromoaniline 

Then react 1,3,5-tribromoaniline  with sodium nitrite and hydrochloric acid at 273 K to form 1,3,5 tribromobenzenediazonium chloride.





Then react the diazonium salt with ethanol/phosphorous acid and water in presence of copper to form  1,3,5 tribromonbenzene.




Detail explanation about the reaction, conditions  and the mechanism is given here by actually conducting the experiment.