Question
Explain cross aldol condensation.
✓
Answer
$(1)$ An aldol condensation between two different carbonyl compounds $($aldehydes and or ketones$)$ takes place even though one of the two carbonyl compounds molecules does not contain $a-$hydrogen atom e.g. $HCHO$ and $C_6H_5CHO.$
$(2)$ If both aldehydes or ketones contain two $a-$hydrogen atoms each, then a mixture of four products, is formed. For example, a mixture of ethanal and propanal on reaction with dilute alkali followed by heating gives a mixture of four products.
Self aldol condensation:
Cross aldol condensation:
$(2)$ If both aldehydes or ketones contain two $a-$hydrogen atoms each, then a mixture of four products, is formed. For example, a mixture of ethanal and propanal on reaction with dilute alkali followed by heating gives a mixture of four products.
Self aldol condensation:
Cross aldol condensation:
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