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Oxymercuration is very regioselective and is a textbook Markovnikov reaction; ruling out extreme cases, the water nucleophile will always preferentially attack the more substituted carbon, depositing the resultant hydroxy group there.
Alkyne oxymercuration-demercuration: In this reaction, HgSO 4 reacts with an alkyne in a Markovnikov regioselective manner to form an enol that is tautomerized into a ketone. This process utilizes anti addition of an OH group to the more substituted carbon, making this reaction a Markovnikov reaction. Alkyne hydroboration-oxidation
Mercury sulfate, as well as other mercury(II) compounds, are commonly used as catalysts in oxymercuration-demercuration, a type of electrophilic addition reaction that results in hydration of an unsaturated compound. The hydration of an alkene gives an alcohol.
In general oxymercuration reactions of alkenes and alkynes using mercuric compounds proceed via organomercury intermediates. A related reaction forming phenols is the Wolffenstein–Böters reaction .
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The reaction thus provides a more stereospecific and complementary regiochemical alternative to other hydration reactions such as acid-catalyzed addition and the oxymercuration–reduction process. The reaction was first reported by Herbert C. Brown in the late 1950s [2] and it was recognized in his receiving the Nobel Prize in Chemistry in 1979.
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The president has signed orders on immigration, regulation and the environment.