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Multiple Choice
Which statement about the Diels-Alder reaction is false?
A
The reaction requires a radical initiator to proceed.
B
The Diels-Alder reaction is stereospecific.
C
The Diels-Alder reaction is a [4+2] cycloaddition reaction.
D
The reaction typically involves a diene and a dienophile.
Verified step by step guidance
1
Understand the Diels-Alder reaction: It is a [4+2] cycloaddition reaction, meaning it involves the interaction of a conjugated diene (4 π-electrons) and a dienophile (2 π-electrons) to form a six-membered ring.
Recognize the stereospecificity: The Diels-Alder reaction is stereospecific, meaning the stereochemistry of the reactants is preserved in the product. This is an important feature of the reaction.
Identify the components: The reaction typically involves a diene, which must be in the s-cis conformation, and a dienophile, which is usually an alkene or alkyne with electron-withdrawing groups to enhance reactivity.
Consider the reaction conditions: The Diels-Alder reaction is a concerted pericyclic reaction and does not require a radical initiator. It proceeds through a single transition state without the formation of intermediates.
Evaluate the false statement: Given the characteristics of the Diels-Alder reaction, the statement that it requires a radical initiator to proceed is false, as the reaction occurs without such initiators.