We start from an aldehyde and ended up with a nitrile.
All the changes happen only on the side chain, so we will ignore reagents that pertain to the reactions of benzne.
In each reaction box, place the best reagent and conditions from the list below.
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Our tutors have indicated that to solve this problem you will need to apply the Carbonyl Retrosynthesis concept. If you need more Carbonyl Retrosynthesis practice, you can also practice Carbonyl Retrosynthesis practice problems.