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Question
How can you change bromoethane to propanal?
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Solution
CH3−CH2−BrKCN−−−→CH3−CH2−CN ↓H2ODiBAL−H CH3−CH2−CHOProponal
In first step Nucleophilic substitution of −CN group take place as Br⊝ is a good leaving group. Then on an addition of H2O in presence of DiBAL−H, partial hydrolysis takes place and we get aldehyde. DiBAL−H is a reducing agent.
↓H2ODiBAL−H
CH3−CH2−CHOProponal
In first step Nucleophilic substitution of −CN group take place as Br⊝ is a good leaving group. Then on an addition of H2O in presence of DiBAL−H, partial hydrolysis takes place and we get aldehyde. DiBAL−H is a reducing agent.
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