Predict the product(s) of the following substitution or elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(e)

검증된 단계별 안내

Analyze the given reactants: The starting material is a brominated compound with a phenyl group (Ph) and a stereocenter. The reagent is sodium azide (NaN₃) in a solvent containing a cyclic ether (likely polar aprotic). This suggests a nucleophilic substitution reaction.

Determine the reaction mechanism: Sodium azide (NaN₃) is a strong nucleophile, and the polar aprotic solvent favors an SN2 mechanism. In an SN2 reaction, the nucleophile attacks the electrophilic carbon directly, leading to inversion of stereochemistry at the stereocenter.

Identify the leaving group: Bromine (Br) is the leaving group. The azide ion (N₃⁻) will replace the bromine via backside attack, resulting in inversion of the stereochemistry at the carbon where bromine was attached.

Predict the stereochemical outcome: Since the reaction proceeds via an SN2 mechanism, the stereochemistry of the product will be inverted relative to the starting material. The azide group (N₃) will occupy the position opposite to the original bromine.

Write the product structure: The product will be a compound where the azide group (N₃) replaces the bromine, with inverted stereochemistry at the carbon center. The phenyl group (Ph) and the ethyl group will retain their original positions.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

주요 개념

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

Nucleophilic Substitution Reactions

Nucleophilic substitution reactions involve the replacement of a leaving group in a molecule by a nucleophile. These reactions can occur via two main mechanisms: SN1, which is a two-step process involving carbocation formation, and SN2, which is a one-step process where the nucleophile attacks the substrate simultaneously as the leaving group departs. Understanding the mechanism is crucial for predicting the products and their stereochemistry.

Elimination Reactions

Elimination reactions involve the removal of a leaving group and a hydrogen atom from adjacent carbon atoms, resulting in the formation of a double bond. The two primary types are E1, which proceeds through a carbocation intermediate, and E2, which is a concerted mechanism. The choice between substitution and elimination often depends on the structure of the substrate and the reaction conditions, influencing the stereochemical outcome.

Stereochemistry

Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In substitution and elimination reactions, the stereochemical outcome can lead to different isomers, such as cis/trans or R/S configurations. Recognizing the stereochemical implications is essential for accurately predicting the products of reactions, especially in cases where chirality is involved.

Predict the product(s) of the following substitution or elimination reactions, paying close attention to the stereochemical outcome of the reactions.(e)