Question
Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile.
✓
Answer
- Taking two molecules of propanal, one which acts as a nucleophile and the other as an electrophile.
- Taking two molecules of butanal, one which acts as a nucleophile and the other as an electrophile.
- Taking one molecule each of propanal and butanal in which propanal acts as a nucleophile and butanal acts as an electrophile.$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{OH}\ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ \ \ \ |\\\text{CH}_3\text{CH}_2\text{CH}_2\text{CHO}+\text{CH}_3\text{CH}_2\text{CHO}\xrightarrow{\ \ \ \ \ \ \ \ }\text{CH}_3\text{CH}_2\text{CH}_2-\text{CH}-\text{CH}-\text{CHO}\\\ \ \ \ \ \ \ \text{Butanal}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Propanal}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{3-Hydroxy-2-methylpentanal}\\ \ \ \ (\text{Electrophile})\ \ \ \ \ \ \ \ \ \ (\text{Nucleophile})$
- Taking one molecule each of propanal and butanal in which propanal acts as an electrophile and butanal acts as a nucleophile.
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