Saturday, August 31, 2013

Cannizzaro Reaction

                             The cannizzaro reaction is a redox reaction. Two molecules ( aliphatic and aromatic aldehydes ) of an aldehyde are reacted to produce a alcohol and carboxylic acid in the presence of strong base.

   a  -   Keto aldehydes give the product of an intramolecular disproportionation in excellent yields.

Mechanism :
NaOH Na +    +  OH –   
Nucleophilic addition of OH- to aldehyde.

The Crossed cannizzaro reaction, uses formaldehyde as reducing agent.

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