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Discuss aldol condensation....

Discuss aldol condensation.

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Cross aldol condensation : Aldol condensation between two different aldehydes and / or ketones is called cross aldol condensation. If both of them.contain `alpha`-hydrogen, a mixture of four products will be obtained.
For example, a mixture of acetaldehyde and propional dehyde undergoes cross aldol condensation in the presence of dilute sodium hydroxide solution to give a mixture of four products
`CH_(3) CHO + CH_(3) CHO overset("dil. NaOH")to CH_(3)- overset(OH)overset(|)(CH)-CH_(2)CHO overset(Delta)to underset("Butan-2-enal")(Ch_(3) - CH = CH) - CHO`
`CH_(3) CH_(2)CHO+ CH_(3) CH_(2) CHO overset(OH)to CH_(3) CH_(2) overset(OH)overset(|)(CH) - underset(CH_(3))underset(|)( CH - CHO) underset(- H_(2) O)overset(Delta) to underset(" 2 - Methylpent - 2 - enal") underset(" "CH_(3))underset(" "|) (CH_(3) CH_(2) CH = C - CHO)`
`CH_(3) CHO + CH_(3) CH_(2) CHO overset( OH) to CH_(3) overset(OH) overset(|) (CH) - underset(CH_(3))underset(|)(CH)-CHO underset(-H_(2)O)overset(Delta )to underset(" 2- methyl but - 2- enal")underset(" "CH_(3)) underset(" "|) (CH_(3) - CH = C - CHOO)`
`CH_(3) CH_(2) CHO + CH_(3) CHO overset( OH) to CH_(3) CH_(2) overset(OH) overset(|)(CH) - CH_(2) CHO underset( - H_(2) O) overset(Delta) to underset("Pent - 2 - enal") (CH_(2) CH_(2) - CH = CH - CHO)`
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