Question:
The products P and Q formed in the reaction are
The products P and Q formed in the reaction are
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Singlet carbenes react stereospecifically with alkenes to give syn cyclopropanes.
Triplet carbenes, in contrast, give mixtures due to stepwise radical addition.
Updated On: Dec 5, 2025
- A
- B
- C
- D
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The Correct Option is B
Solution and Explanation
Step 1: Type of reaction.
A carbene (:CFCI) in the singlet state undergoes stereospecific cycloaddition to alkenes, forming cyclopropane derivatives.
Step 2: Mechanistic pathway.
- Singlet carbenes add to the same face of the double bond (syn addition).
- The product retains the stereochemistry of the alkene substituents.
- Here, isobutene reacts to form a cyclopropane ring substituted with –Cl and –F atoms on the same carbon.
Step 3: Conclusion.
The major product corresponds to structure (A).
A carbene (:CFCI) in the singlet state undergoes stereospecific cycloaddition to alkenes, forming cyclopropane derivatives.
Step 2: Mechanistic pathway.
- Singlet carbenes add to the same face of the double bond (syn addition).
- The product retains the stereochemistry of the alkene substituents.
- Here, isobutene reacts to form a cyclopropane ring substituted with –Cl and –F atoms on the same carbon.
Step 3: Conclusion.
The major product corresponds to structure (A).
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