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Ch. 16 - Metals in Organic Chemistry
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Mullins 1st EditionCh. 16 - Metals in Organic Chemistry문제 23a
15장, 문제 23a

Predict the product of the following Negishi coupling reactions.
(a) Chemical reaction diagram showing a brominated aromatic compound reacting with an alkene in the presence of zinc chloride and palladium catalyst.

검증된 단계별 안내
1
Identify the reactants involved in the Negishi coupling reaction. In this case, we have a bromobenzene derivative and an organozinc compound.
Understand the role of the catalyst and solvent. The reaction uses a palladium catalyst, Pd(PPh3)4, and is carried out in tetrahydrofuran (THF) at 0°C.
Recognize the mechanism of the Negishi coupling reaction. The palladium catalyst facilitates the formation of a carbon-carbon bond between the aryl halide and the organozinc reagent.
Predict the product by replacing the bromine atom on the aromatic ring with the alkyl group from the organozinc compound. This results in the formation of a new C-C bond.
Draw the structure of the product, which is a combination of the aromatic ring with the methoxy group and the alkyl chain from the organozinc reagent, now attached to the position where the bromine was originally located.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
2m

주요 개념

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

Negishi Coupling Reaction

Negishi coupling is a cross-coupling reaction that forms carbon-carbon bonds between an organozinc compound and an organic halide, facilitated by a palladium catalyst. This reaction is highly useful in organic synthesis for constructing complex molecules. The presence of a palladium catalyst and a suitable solvent, such as THF, is crucial for the reaction's success.
추천 영상:
03:18
Negishi Coupling Reaction

Role of Palladium Catalyst

Palladium catalysts, such as Pd(PPh3)4, are essential in facilitating the Negishi coupling reaction. They enable the oxidative addition of the organic halide to the palladium, followed by the transmetalation with the organozinc reagent, and finally, reductive elimination to form the desired carbon-carbon bond. The catalyst's efficiency is influenced by its ligands and the reaction conditions.
추천 영상:
가이드 코스
3:21
Catalytic Allylic Alkylation Concept 1

Transmetalation Process

Transmetalation is a key step in the Negishi coupling where the organozinc reagent transfers its organic group to the palladium complex. This step is crucial for forming the new carbon-carbon bond. The organozinc compound's reactivity and the reaction conditions, such as temperature and solvent, play significant roles in the efficiency of this process.
추천 영상:
05:13
Buchwald-Hartwig Amination Reaction
관련 실천
교과서 질문

Suggest a mechanism for the reaction shown in Figure 16.30 using IZnCH₂I as the cyclopropanating reagent.

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교과서 질문

Work backward to an appropriate organozinc halide and organohalide to make the bonds indicated by the blue arrows. There may be two possibilities for each.

(b)

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교과서 질문

Predict the product of the following Negishi coupling reactions.

(b)

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교과서 질문

Predict the product of the following reactions.

(b)

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교과서 질문

Work backward to an appropriate organozinc halide and organohalide to make the bonds indicated by the blue arrows. There may be two possibilities for each.

(a)

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교과서 질문

To determine the stereochemistry of curacin A by synthesis, it would have been necessary to prepare all stereoisomers of the C₁₇―C₂₀ cyclopropane fragment. How would the reaction in Figure 16.30 be modified to produce the other stereoisomers shown here?

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