Alkene which give same product on reaction with hydroboration and oximercuration-demercuration i

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Alkene which give same product on reaction with...

Key Concepts

Hydroboration-Oxidation

Hydroboration-oxidation is a two-step reaction in which a borane reagent (BH3 or its derivatives) adds across the double bond of an alkene in a syn addition manner, followed by oxidation with hydrogen peroxide to yield an alcohol. This process proceeds with anti-Markovnikov regioselectivity, meaning the hydroxyl group attaches to the less substituted carbon, due to the nature of the boron addition step.

Oxymercuration-Demercuration

Oxymercuration-demercuration is a reaction that uses mercuric acetate to form a cyclic mercurinium ion intermediate, followed by nucleophilic attack by water. The subsequent demercuration step, typically with sodium borohydride, replaces the mercury with a hydrogen atom. This reaction proceeds with Markovnikov regioselectivity without the risk of carbocation rearrangement, which is typical in acid-catalyzed hydration.

Regiochemistry

Regiochemistry in alkene addition reactions refers to the orientation of the added substituents on the carbon atoms of the double bond. In hydroboration-oxidation, the reaction yields an anti-Markovnikov product, whereas oxymercuration-demercuration gives a Markovnikov product. When both reactions yield the same product, it implies that the alkene substrate has a symmetry or substitution pattern such that the inherent regiochemical preferences of each method converge to produce the same structural outcome.

Substrate Symmetry

Substrate symmetry is a concept where the alkene has equivalent or symmetric environments around the double bond, meaning that the addition of substituents (whether following Markovnikov or anti-Markovnikov rules) results in the same product. This symmetrical arrangement overrides the typical differences in regiochemistry between hydroboration-oxidation and oxymercuration-demercuration.

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