Show how the following compounds can be synthesized from benzene:
a. N,N,N-trimethylanilinium iodide

검증된 단계별 안내

Step 1: Begin with benzene as the starting material. Perform a Friedel-Crafts alkylation reaction using methyl chloride (CH₃Cl) and aluminum chloride (AlCl₃) as a catalyst to introduce a methyl group onto the benzene ring, forming toluene (methylbenzene).

Step 2: Oxidize the methyl group on toluene to a carboxylic acid group using an oxidizing agent such as potassium permanganate (KMnO₄) under acidic or basic conditions. This converts toluene into benzoic acid.

Step 3: Reduce the carboxylic acid group on benzoic acid to an amine group (-NH₂) using a reaction such as the Schmidt reaction or by converting the acid to an amide followed by reduction with lithium aluminum hydride (LiAlH₄). This forms aniline (C₆H₅NH₂).

Step 4: Perform a methylation reaction on the aniline using excess methyl iodide (CH₃I) in the presence of a base such as potassium carbonate (K₂CO₃). This introduces three methyl groups onto the nitrogen atom, forming N,N,N-trimethylaniline.

Step 5: React N,N,N-trimethylaniline with methyl iodide (CH₃I) to quaternize the nitrogen atom, forming N,N,N-trimethylanilinium iodide as the final product.

비슷한 문제에 대한 검증된 영상 답변:

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. In the synthesis of N,N,N-trimethylanilinium iodide from benzene, the first step involves the introduction of a nitrogen-containing electrophile, which forms a substituted aromatic compound. This reaction is crucial for modifying aromatic compounds to create more complex structures.

Quaternization of Amines

Quaternization of amines refers to the process of converting a tertiary amine into a quaternary ammonium salt by reacting it with an alkyl halide. In this case, the nitrogen atom in the aniline derivative formed from benzene is further reacted with methyl iodide to produce N,N,N-trimethylanilinium iodide. This step is essential for achieving the final product with the desired ionic character.

Nucleophilicity and Electrophilicity

Nucleophilicity refers to the ability of a species to donate an electron pair, while electrophilicity is the ability to accept an electron pair. In the context of the reaction, the nitrogen atom in the amine acts as a nucleophile, attacking the electrophilic carbon of the alkyl halide (methyl iodide). Understanding these concepts is vital for predicting the outcome of reactions involving aromatic compounds and their derivatives.

Show how the following compounds can be synthesized from benzene:a. N,N,N-trimethylanilinium iodide