Multiple Choice
Which of the following reactions is primarily responsible for the propagation and replication of prions?
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3. Acids and Bases
Organic Chemistry Reactions
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Which of the following statements is true about the reaction mechanism of the Diels-Alder reaction?
A
It requires a radical initiator to proceed.
B
It proceeds through a carbocation intermediate.
C
It is a nucleophilic substitution reaction.
D
It involves a concerted pericyclic reaction between a diene and a dienophile.
Verified step by step guidance1
Understand the Diels-Alder reaction: It is a [4+2] cycloaddition reaction where a conjugated diene reacts with a dienophile to form a cyclic compound.
Recognize that the Diels-Alder reaction is a pericyclic reaction, which means it proceeds through a concerted mechanism. This implies that bonds are formed and broken in a single step without intermediates.
Identify that the reaction does not involve radicals, carbocations, or nucleophilic substitutions. These are characteristics of other types of reactions, not pericyclic reactions.
Recall that a radical initiator is typically used in reactions that proceed via a radical mechanism, such as polymerizations, which is not applicable to the Diels-Alder reaction.
Conclude that the correct statement is that the Diels-Alder reaction involves a concerted pericyclic reaction between a diene and a dienophile, as it aligns with the characteristics of the reaction mechanism.
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