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Organic Chemistry
formaldehyde and benzaldehyde do not show aldol condnsation due to lack of alpha hydrogen
then why do they show cross aldol condenstion
also it is given in my book formaldehyde undergoes series of aldol condensation to form sugar .please explain this
Comments (5)
formaldehyde and benzeldehyde both which do naot have alpha hydrogen undergoes series to form 3 phenyl pro2enal
(C6H5)CHO + CH3CHo = (C6H5) CH(OH) -CH2-CHO = (C6H5)-CH=CH-CHO
the reason might some reasonance and all that
also formaldehyde IN PRESENCE OF DILUTE ALKALI forms fromose
i think the proton of water attaches with oxygen
!!!!!!!!!!!!!!!!!!!!
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-hydrogen. In acataldehyde we've alpha hydrogen hence it forms carbanion which then reacts with benzaldehyde to give you the product.







hence they show cross aldol condensation