Class 12 Chemistry Aldehydes Ketones Acids Methods for preparing only aldehydes

Methods for preparing only  aldehydes

From acid chlorides - Rosenmund reaction

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_From_Acid_Chlorides

 

Drawback – Formaldehyde can’t be prepard by this method : formyl chloride H – COCl  is unstable .Aldehydes can be further reduced to alcohol. So, in order to stop it at aldehyde stage we have to poison it.

 

2.From reduction of alkyl cyanides – known as Stephen’s reduction (use of SnCl2)

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_From_Alkyl_Cyanides

This can also be occur in presence of other reducing agent like  – DIBAL. (Disobutyl aluminiun hydride ).It is used  for long chain nitrils.

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_From_Alkyl_Cyanides_1

2.Oxidation reaction – from hydrocarbons

  •  Oxidation of methyl benzene

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_From_Hydrocarbons

  •      Use of chromyl chloride - Etard reaction

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_Etard_Reaction

  •  Side chain chlorination followed by hydrolysis

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_Chlorination

  • Gatterman kosh reaction

 Class_12_Aldehydes_&_Ketones_Preparation_Of_Aldehydes_Gatterman_Kosh

 

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