Question

The major product of the reaction is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is A

This reaction involves a sequence of organic transformations typical of multipurpose synthetic routes used in modern organic chemistry.

Let's analyze the steps involved in this reaction:

1. Reagent (i): CH₂I₂, Zn-Cu
   • This step involves the Simmons-Smith reaction, which is known for converting alkenes to cyclopropanes using a diiodomethane and a zinc-copper couple.
   • The Simmons-Smith reagent (CH₂I₂, Zn-Cu) forms a carbenoid species that transforms the alkene group into a cyclopropane ring.
2. Reagent (ii): Li, NH₃ (liq.)
   • This step is a Birch reduction, a method to selectively reduce aromatic compounds into non-aromatic compounds.
   • In this context, the product from step 1 undergoes further reduction, affecting other unsaturated bonds present.
3. Reagent (iii): H₃O⁺
   • This protonation step neutralizes any remaining charges or alkoxide ions formed throughout the reaction sequence, finalizing the structure of the molecule.

By understanding the complete reaction mechanism involving all steps, we can deduce that the structure of the product formation corresponds to the following option:

Hence, the major product of the given reaction sequence is correctly expressed by the above structure.