How can I achieve the following reaction where the iodide gets replaced by an aldehyde? [closed]








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The question is what other chemicals need to be added so that the reaction is possible.


Although the solution shouldnt be that hard, I couldnt find the answer to this one.




Note that the reaction adds a carbon to the struture.
This can be done in two steps:


1. React the iodide with NaCN or KCN in DMSO to form the nitrile
2. Reduce the nitrile to the aldehyde with di-isobutylaluminium hydride [Dibal-H](https://commonorganicchemistry.com/Rxn_Pages/Nitrile_to_Aldehyde/Nitrile_to_Aldehyde_Index.htm)


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