The major products X and Y formed in the following reaction sequences are:
The major products X and Y formed in the following reaction sequences are:
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The Correct Option is D
Solution and Explanation
Step 1: Hydroboration–Carbonylation Reaction
- Thexyborane adds to the alkene via hydroboration.
- Then CO and H2O are used under palladium catalysis for carbonylation (oxo process), giving an aldehyde intermediate.
- Final oxidation step (NaOAc, H2O2) leads to formation of a ketone.
This forms the X product shown in option (D): a cyclooctanone derivative with correct regioselectivity.
Step 2: Alpha-Functionalization via Enolate Chemistry
- LDA (base) forms the enolate.
- TMSCl traps the enolate as a silyl enol ether.
- PhSCl introduces a phenylsulfenyl group alpha to the carbonyl.
- m-CPBA oxidizes the PhS group to PhSO.
- Thermolysis results in a [2,3]-sigmatropic rearrangement and elimination to regenerate the carbonyl.
This process leads to a rearranged product Y consistent with option (D).
\[ \boxed{\text{Correct structures: X and Y are as shown in option (D)}} \]
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