Methyl vinyl ketone on reaction with LiCuMe_2 | vedclass

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(A) Methyl vinyl ketone is $CH_3-CO-CH=CH_2$.$LiCuMe_2$ (Gilman reagent) is a soft nucleophile that undergoes conjugate addition ($1$,$4$-addition) to

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(A) Methyl vinyl ketone is $CH_3-CO-CH=CH_2$.$LiCuMe_2$ (Gilman reagent) is a soft nucleophile that undergoes conjugate addition ($1$,$4$-addition) to $\alpha,\beta$-unsaturated carbonyl compounds.In the reaction of methyl vinyl ketone with $LiCuMe_2$,the methyl group $(CH_3^-)$ attacks the $\beta$-carbon of the double bond.The resulting enolate is then protonated during workup to give $CH_3-CO-CH_2-CH_2-CH_3$ (pentan$-2-$one).The structure corresponding to pentan$-2-$one is shown in option $A$.

Methyl vinyl ketone on reaction with $LiCuMe_2$ gives a major product,whose structure is

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