base dimer base 9. At which carbon in the final product is there a methyl?

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Question

Answer 1

Answer #1

The Methyl group is present in the Final product at the bth carbon atom,
Here the Dimer formation is the Aldol condensation reaction between the two Acetaldehyde, to give the 3-buten-2-one.
Which on further reacts with the Enolate of the Acetone in presence of base to gives the FINAL PRODUCT.
In the final product the methyl is in the 'b'th carbon atom.

Reaction and its mechanism of the product formation is shown clearly in the following pictures

Mechanism :- -BH -B-elimination ___e --0H b t [product ] methyl in b carbon

Answer 2

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