React the Weinreb amide with the Grignard reagent derived from your (benzylmagnesium bromide) to cleanly deliver the target ketone, 4-methyl-1-phenylpentan-2-one , without over-addition. 4. Complex Molecular Rearrangements

Retrosynthesis demands looking backward from a target molecule to simple starting materials. Advanced synthesis questions focus on strategic bond disconnections using modern transformations. Problem 4: Target Molecule Disconnection

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