Problem: Alkylations of the enolate of ketone A produce almost exclusively the dialkylation product, as shown below. Demonstrate how you would use an enamine to prepare monoalkylated ketone B.  

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Alkylations of the enolate of ketone A produce almost exclusively the dialkylation product, as shown below. Demonstrate how you would use an enamine to prepare monoalkylated ketone B.