Abstract Reactions of alkenols with H 2 O 2—LiBr—Ce (NO 3) 3· 6H 2 O or H 2 O 2—LiBr— Ce (NH 4) 2 (NO 3) 6 system led to bromination of the double bond to yield vicinal dibromoalkanols. The reaction proceeded highly selectively, no oxidation of the hydroxyl