Please help :( Why is the following product not formed in the aldol reaction bel

Question

Please help :(

Why is the following product not formed in the aldol reaction below? A ketone enolate cannot add into a ketone. The cyclopropane ring is too strained to form. The two ketones are too far apart. NaOCH3 is not a strong enough base. Which reagents could be used to form the following ketoester? Acetone, diethyl carbonate: sodium ethoxide Acetone, diethyl carbonate, sodium methoxide Ethyl acetate, acetone, sodium ethoxide Ethyl acetate, ethyl bromide, LDA Select the structure of the major product of the following reaction sequence.

Explanation / Answer

2) B

3) C

4) B

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