Draw the structures of alkenes that would yield the following alcohols on hydration (red = O). T

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Draw the structures of alkenes that would yield the...

Key Concepts

Oxymercuration-Demercuration

Oxymercuration-demercuration is a mechanism for alkene hydration that involves the formation of a mercurinium ion intermediate, which is then opened by water and subsequently reduced. This process results in the Markovnikov addition of water to the alkene and reduces the risk of carbocation rearrangements, offering a controlled pathway to the formation of more substituted alcohols.

Alkene Hydration Reaction

Alkene hydration involves adding water across the carbon–carbon double bond to form an alcohol. This fundamental reaction illustrates how alkenes can be transformed into functionalized compounds, and understanding the underlying mechanism is crucial for predicting the location at which the hydroxyl group will be added.

Regioselectivity (Markovnikov vs. anti-Markovnikov Addition)

Regioselectivity in alkene hydration determines which carbon of the double bond receives the hydroxyl group versus the hydrogen. In Markovnikov addition, the –OH group attaches to the more substituted carbon, whereas in anti-Markovnikov addition, it attaches to the less substituted carbon. This selectivity is guided by the reaction mechanism and potential intermediates involved.

Hydroboration-Oxidation

Hydroboration-oxidation is a two-step process that transforms alkenes into alcohols through syn-addition of borane followed by oxidative workup. This mechanism is notable for its anti-Markovnikov regiochemistry, producing alcohols at the less substituted carbon atom, and it avoids the formation of carbocation intermediates that could lead to rearrangements.

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