The ketone shown is oxidised with m-CPBA. Which structure is the major product?

AStructure A
BStructure B
CStructure C
DStructure D

Answer: D

The compound is pinacolone (3,3-dimethylbutan-2-one). The tertiary alkyl group has the highest migratory aptitude, so tert-butyl moves to oxygen and tert-butyl acetate forms. Methyl migration would give methyl pivalate.

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