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Discussion Response Post to: Plz explain in detail cross aldol condensation rxn

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abhilash (161)

Cool goIITian

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you see in aldol two the anion of a aldehye attacks on another molecule of same aldehyde. but in cross aldo the anion of an alde hyde attacks on another aldehye.
for e.g.
HCHO + CH3CHO---NaOH---->
i)OH- can't extract alpha H+ from HCHO since it doesn't have,so it will take H+ from CH3CHO and forms anion CH2(-)CHO.
ii)this CH2(-)CHO has two chances:-
a) attacks on HCHO:-
when it attacks on HCHO this will be a cross aldol product
HCHO + CH2(-)CHO ------> CH2(OH)CH2CHO
b) it can attack on another molecule of CH3CHO
this will be a self aldol product:-
CH3CHO + CH2(-)CHO -----> CH3-CH(OH)-CH2CHO

Is it ok
if something is wrong please tell me

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