Aldehydes Ketones from Fatty Acids

(a) By heating calcium salt of fatty acids: Aldehydes are obtained by  heating calcium salts of fatty acids with calcium formate to about 675 K.



Ketones are formed by distilling calcium salt of the fatty acid alone.        
                                                                                                             


Similarly, mixed ketones can also be obtained by similar reactions.



It must be noted here that the yield of aldehydes and ketones is poor for this reaction because a number of other products may also be obtained. For example, the reaction of calcium acetate and calcium formate also gives acetone and formaldehyde along with acetaldehyde.
    
(b) By passing vapours of fatty acids over manganous oxide: in this method, formic acid alone gives formaldehyde. Acetic acid gives acetone and the mixture of two acids i.e. formic and acetic acids produce acetaldehyde.

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