Question

Organic preparation of tribromobenzene using diazortization

Answer 1

First react phenol with ammonia in presence of zinc chloride to obtain aniline.

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Then react aniline with bromine water to form 1,3,5-tribromoaniline enter image description here

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

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