The compound shown is treated with m-CPBA. Which structure is the main product?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: D

The compound is acetophenone. In the Baeyer-Villiger oxidation the group that migrates to oxygen is the one better able to carry positive charge; phenyl migrates in preference to methyl, so the ester formed is phenyl acetate. Methyl migration would give methyl benzoate.

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