The major product of the following reaction is
To determine the major product of the reaction, we need to understand the role of reagents and the structure of the starting material.
In the given reaction, the reagent used is potassium hydride (KH), which is a strong base. The primary function of this base is deprotonation.
The starting material has a silyl ether protective group (SiMe3) adjacent to the hydroxyl group (OH). Here's the step-by-step analysis:
- Deprotonation: KH will deprotonate the hydroxyl group, forming an alkoxide ion. This is because KH is a strong enough base to remove the proton from the alcohol.
- Intramolecular Reaction: Once the alkoxide is formed, it can attack the silicon atom in the silyl ether group. This results in an intramolecular reaction where the SiMe3 group is eliminated, forming a cyclic ether through a process known as intramolecular silylation.
The major product of this reaction is a cyclic ether formed due to the removal of the trimethylsilyl group and the closure of the oxygen atom to create a ring. This transformation is favored due to the formation of a stable ring structure.
This product corresponds to the correct answer as identified by the provided options. The other options would involve incorrect or less favorable rearrangements.
Therefore, the major product of the given reaction is 
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