Textbook Question
Show how Diels–Alder reactions might be used to synthesize the following compounds.
(g)
(h)
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16. Conjugated Systems
Diels-Alder Retrosynthesis
4:37 minutesProblem 47f
Textbook Question
What diene and what dienophile should be used to synthesize the following?
f. 
Verified step by step guidance1
Analyze the target molecule: The structure contains a six-membered ring with one double bond and two carboxylic acid groups attached at the 1 and 4 positions. This suggests that the molecule was formed via a Diels-Alder reaction.
Identify the diene: The Diels-Alder reaction requires a conjugated diene. In this case, the diene should be a molecule with two conjugated double bonds that can form the six-membered ring upon reaction.
Identify the dienophile: The dienophile is typically an electron-deficient alkene or alkyne. Here, the two carboxylic acid groups in the product suggest that the dienophile should contain two electron-withdrawing groups, such as two carboxylic acid groups or their derivatives.
Determine the orientation: The stereochemistry of the product indicates that the reaction occurred in a specific orientation. The cis relationship between the carboxylic acid groups suggests that the dienophile was likely a cis-substituted alkene.
Combine the components: Based on the analysis, the diene could be 1,3-butadiene, and the dienophile could be cis-1,2-ethene-dicarboxylic acid (maleic acid). These reactants would undergo a Diels-Alder reaction to form the given product.
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4mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Diels-Alder Reaction
The Diels-Alder reaction is a cycloaddition reaction between a conjugated diene and a dienophile, forming a six-membered ring. This reaction is a key method in organic synthesis for constructing complex cyclic structures and is characterized by its stereospecificity and regioselectivity. Understanding the mechanism and the requirements for both the diene and dienophile is essential for predicting the products formed.
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Conjugated Dienes
Conjugated dienes are compounds that contain two double bonds separated by a single bond, allowing for resonance stabilization and increased reactivity in cycloaddition reactions. The ability of these dienes to adopt an 's-cis' conformation is crucial for their participation in the Diels-Alder reaction, as this conformation allows for optimal overlap with the dienophile's π orbitals during the reaction.
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Dienophile
A dienophile is an electron-deficient alkene or alkyne that reacts with a diene in the Diels-Alder reaction. The reactivity of a dienophile is influenced by its substituents; electron-withdrawing groups enhance its ability to participate in the reaction. Identifying the appropriate dienophile is critical for achieving the desired product, as it determines the regioselectivity and stereochemistry of the resulting cyclohexene derivative.
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