QuestionCarbonyl chemistry / intramolecular Michael addition
The precursor [X] in the following reaction is


- (a) Methyl 3-oxo-4-(3-oxocyclohex-1-en-1-yl)butanoate (side chain on the β-carbon of the enone)
- (b) Methyl 3-oxo-4-(4-oxocyclohex-2-en-1-yl)butanoate (side chain on the γ-carbon of the enone)
- (c) Methyl 3-oxo-4-(5-oxocyclohex-3-en-1-yl)butanoate (side chain meta to C=O)
- (d) Methyl 3-oxo-4-(5-oxocyclohex-1-en-1-yl)butanoate (ring C=C not conjugated with the C=O)
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