what is the mechanism of a cannizaro reaction

what is the mechanism of a cannizaro reaction


2 Answers

27 Points
9 years ago

1. the attack of oh- as a nucleophile on the 1st molecule

2. h- transfer from 1st to 2nd molecule

3. h(plus) from carboxylic acid to alkoxide

Vikash Kumar
36 Points
9 years ago


as shown above the cannizzaro reaction begins with the attack of hydroxide ion on th C=O group. the second step is the rate determining step of the reaction as it is difficult to break C-H bond and tranfer hydride to carbonyl carbon of other group and making it alcohol by gaining H+ from solvent or from COOH portion as shown in the second figure of the first reaction. so it is a redox reaction of an aldehyde lacking hydrogen at the alpha position into its alcohol and corresponding carboxyllic acid.

vikash kumar

Btech. IIT Delhi

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