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Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471당신이 사용하는 게 아니라요?교과서 변경
10장, 문제 52b

Provide the mechanism of the radical reactions shown.
(b) Chemical reaction showing allylic bromination with NBS and heat, resulting in bromine addition to a cyclohexene structure.

검증된 단계별 안내
1
Identify the type of radical reaction involved. Radical reactions typically include initiation, propagation, and termination steps.
Initiation: Determine the source of radicals. This often involves the homolytic cleavage of a bond, usually facilitated by heat or light, to generate two radicals. Represent this step using curved single-headed arrows to show the movement of a single electron.
Propagation: Identify the steps where radicals react with stable molecules to form new radicals. This usually involves two main steps: the radical reacts with a molecule to form a new radical and a new molecule, and then this new radical reacts further to propagate the chain reaction. Use single-headed arrows to show electron movement.
Termination: Determine how the radicals are removed from the reaction mixture. This can occur when two radicals combine to form a stable molecule, effectively ending the chain reaction. Again, use single-headed arrows to depict the electron pairing.
Draw the complete mechanism, ensuring that all steps are balanced in terms of electron count and that the movement of electrons is clearly indicated with appropriate arrows. Verify that the mechanism is consistent with the principles of radical stability and reactivity.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
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10m

주요 개념

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

Radical Formation

Radical formation involves the homolytic cleavage of a covalent bond, resulting in two radicals, each possessing an unpaired electron. This process is typically initiated by heat or light, which provides the energy needed to break the bond. Understanding how radicals are generated is crucial for predicting the behavior and reactivity in radical reactions.
추천 영상:
가이드 코스
1:30
Radical Polymerization Concept 4

Propagation Steps

Propagation steps in radical reactions involve the radicals reacting with stable molecules to form new radicals, perpetuating the reaction cycle. These steps are essential for the continuation of the radical chain reaction, where the radical species generated in one step react further to produce additional radicals, driving the reaction forward until termination.
추천 영상:
가이드 코스
1:05
Step-Growth Polymers Concept 1

Termination Steps

Termination steps occur when two radical species combine to form a stable, non-radical product, effectively ending the radical chain reaction. This can happen through various pathways, such as radical recombination or disproportionation. Understanding termination is key to controlling radical reactions and preventing unwanted side reactions or polymerization.
추천 영상:
가이드 코스
1:05
Step-Growth Polymers Concept 1