Show how you can synthesize the following compounds starting with benzene, toluene, and alcohols containing no more than four carbon atoms as your organic starting materials. Assume that para is the major product (and separable from ortho) in ortho, para mixtures.
(a) pentan-1-amine

검증된 단계별 안내

Step 1: Start with benzene as the base compound. To introduce an alkyl chain, perform a Friedel-Crafts alkylation using 1-chloropentane (C5H11Cl) and AlCl3 as the catalyst. This will yield pentylbenzene.

Step 2: To introduce an amino group (-NH2) onto the alkyl chain, first convert the terminal carbon of the pentyl chain into a functional group that can be further modified. Perform a bromination reaction using N-bromosuccinimide (NBS) and light (hv) to selectively brominate the benzylic position, forming 1-bromo-5-phenylpentane.

Step 3: Replace the bromine atom with an amino group by performing a nucleophilic substitution reaction (SN2). React 1-bromo-5-phenylpentane with excess ammonia (NH3) to yield pentan-1-amine.

Step 4: To ensure the para product is the major product in any intermediate steps involving substitution on the benzene ring, carefully control reaction conditions and use separation techniques to isolate the para isomer if necessary.

Step 5: Verify the structure of the final product, pentan-1-amine, using spectroscopic techniques such as NMR and IR to confirm the presence of the amine group and the correct carbon chain length.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

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

Electrophilic Aromatic Substitution (EAS)

Electrophilic Aromatic Substitution is a fundamental reaction in organic chemistry where an electrophile replaces a hydrogen atom on an aromatic ring, such as benzene. This reaction is crucial for synthesizing various compounds from aromatic starting materials. Understanding the mechanism of EAS, including the formation of the sigma complex and the role of activating and deactivating groups, is essential for predicting the products of reactions involving benzene and its derivatives.

Nucleophilic Substitution Reactions

Nucleophilic substitution reactions involve the replacement of a leaving group in a molecule with a nucleophile. In the context of synthesizing amines, this often involves the reaction of alkyl halides with nucleophiles like amines. Recognizing the difference between SN1 and SN2 mechanisms is important, as they dictate the reaction conditions and the stereochemistry of the products formed during the synthesis of pentan-1-amine.

Functional Group Interconversion

Functional group interconversion refers to the transformation of one functional group into another within a molecule. This concept is vital for synthesizing complex organic compounds, as it allows chemists to modify existing structures to achieve desired functionalities. In the synthesis of pentan-1-amine, converting alcohols or aromatic compounds into amines through various reactions, such as reduction or substitution, exemplifies the importance of this concept in organic synthesis.

Show how you can synthesize the following compounds starting with benzene, toluene, and alcohols containing no more than four carbon atoms as your organic starting materials. Assume that para is the major product (and separable from ortho) in ortho, para mixtures.(a) pentan-1-amine