Show how to synthesize the following compounds, using appropriate carboxylic acids and amines.
(a)

검증된 단계별 안내

Step 1: Identify the functional groups in the target molecule, DEET. It contains an amide functional group (-CONR2) attached to a benzene ring with a methyl substituent in the meta position.

Step 2: Select the appropriate carboxylic acid precursor. The carboxylic acid should have the benzene ring with a methyl group in the meta position relative to the carboxylic acid group. This compound is meta-toluic acid (C8H8O2).

Step 3: Choose the amine precursor. The amine required is diethylamine (CH3CH2)2NH, as the amide group in DEET contains two ethyl groups attached to the nitrogen atom.

Step 4: Perform the synthesis reaction. React meta-toluic acid with diethylamine in the presence of a dehydrating agent such as dicyclohexylcarbodiimide (DCC) or by using acid chloride formation followed by amine addition. This will result in the formation of the amide bond.

Step 5: Purify the product. Use techniques such as recrystallization or chromatography to isolate and purify the synthesized DEET compound.

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주요 개념

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Carboxylic Acids

Carboxylic acids are organic compounds characterized by the presence of a carboxyl group (-COOH). They are important in organic synthesis as they can react with amines to form amides. Understanding the reactivity and properties of carboxylic acids is crucial for synthesizing compounds like DEET, where the carboxylic acid serves as a precursor in the formation of the amide bond.

Amines

Amines are organic compounds derived from ammonia by replacing one or more hydrogen atoms with alkyl or aryl groups. They can act as nucleophiles in chemical reactions, particularly in the formation of amides from carboxylic acids. In the synthesis of DEET, the amine component is essential for creating the desired structure and functionality of the insect repellent.

Amide Formation

Amide formation is a key reaction in organic chemistry where a carboxylic acid reacts with an amine to produce an amide and water. This reaction is significant in the synthesis of various compounds, including pharmaceuticals and agrochemicals. In the case of DEET, understanding the mechanism of amide formation helps in designing the synthesis pathway and optimizing reaction conditions.

Show how to synthesize the following compounds, using appropriate carboxylic acids and amines.(a)