Quinones-VII: Halogenation and oxidative halogenation of phenols with hydrogen halides/hydrogen peroxide. Synthesis of p-chloranil and p-bromanil 

 -  Tetrahedron, 34(10), p.1577-1579, 1978 .
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<br/><br/> Chloranil 6 and bromanil 7 are prepared in very good yields from phenol or hydroquinone with concentrated hydrochloric or hydrobromic acid/30% hydrogen peroxide and magnesium chloride as catalyst. With catechol the reaction stops at the tetrachloro- or tetrabromo-o-hydroquinone (4 or 5) stage. The iodination of phenol with potassium iodide/hydrogen-peroxide in acetic acid yields 2,4,6-tri-iodophenol (3).