(••) Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (iii) Br₂, H₂O (h)

검증된 단계별 안내

Identify the type of reaction: The reaction of an alkene with Br₂ in the presence of H₂O is a halohydrin formation reaction.

Understand the mechanism: The reaction proceeds via the formation of a bromonium ion intermediate, which is then attacked by water.

Determine regioselectivity: The water molecule will attack the more substituted carbon of the bromonium ion, leading to Markovnikov addition.

Consider stereochemistry: The addition of Br and OH will be anti, meaning they will add to opposite sides of the double bond.

Predict the product: The final product will be a halohydrin, with a bromine atom and a hydroxyl group added across the double bond.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Electrophilic Addition

Electrophilic addition is a fundamental reaction mechanism in organic chemistry where an electrophile reacts with a nucleophile, typically involving alkenes. In the case of alkenes reacting with Br₂, the double bond acts as a nucleophile, attacking the electrophilic bromine molecule, leading to the formation of a cyclic bromonium ion intermediate.

Bromohydrin Formation

Bromohydrin formation occurs when an alkene reacts with bromine in the presence of water. The bromonium ion intermediate is attacked by water, leading to the formation of a bromohydrin, which is a compound containing both a bromine atom and a hydroxyl group (-OH) on adjacent carbon atoms, resulting in a vicinal dibromide.

Regioselectivity

Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple products are possible. In the reaction of alkenes with Br₂ and H₂O, the regioselectivity is influenced by the stability of the carbocation intermediates formed during the reaction, often leading to the more substituted alcohol being produced as the major product.