Addition of LiAlH4 to aldehydes to give primary alcohols

by James

Description: Addition of lithium aluminum hydride to aldehydes leads to formation of primary alcohols (after addition of acid) Content available for Reactionguide members only. Not a member? Get access for about 30 cents / day!

{ 5 comments… read them below or add one }


Hi,i have a question about the reduction of an aldehyd to a primary alcohol,in the class I learned that it can be done either with adding NaBH4+etoh(weak acid) or with LiAlH4 and than we have to add et2o and not an acid????



Reduction of aldehydes can be performed with NaBH4 or LiAlH4. If ether is mentioned, it acts as a solvent only. The second step is addition of some kind of proton source to give the neutral alcohol. This is sometimes written as H3O+ or NH4Cl.


Tasdique Quadery

Will it work with just H2O workup without any acid?


Alexis Espinoza

What is the difference between the reduction of aldehydes between NaBH4 and LiAlH4?



They work the same way. NaBH4 is milder than LiAlH4 but the reaction works equally well.


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