Oxymercuration demercuration hydration procedure is superior to acid- catalysed hydration of most alkenes. Why ?

Oxymercuration demercuration hydration procedure is superior to acid- catalysed hydration of most alkenes. Because (1) the two stage process of oxymercuration demercuration is fast and takes place under mild condilions and gives more than 90 % yield of alcohol and (2) rearrangement doesn't take place hence most desire product easily obtained.

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