University:
California State University, Northridge
Course:
CHEM 534 | Advanced Organic Chemistry
Academic year:

2020
Views:

232

Pages:

3
Author:

gewoekerdodx

Lab #2: Cannizaro Reaction Introduction: Cannizzaro reaction is an organic disproportionation reaction of an aldehyde without active hydrogen that undergoes intermolecular redox reaction under the action of a strong base. The Italian chemist Stanislaus Cannizzaro obtained benzaldehyde and benzyl alcohol by treating benzaldehyde with grass ash in 1895. This reaction was first discovered, hence the name Cannizzaro reaction. Fatty aldehydes, aromatic aldehydes, or heterocyclic aldehydes that do not contain α-hydrogen atoms undergo simultaneous oxidation and reduction reactions of the aldehyde molecules under the action of concentrated bases to form the corresponding carboxylic acids (carboxylate salts in alkaline solutions) and alcohol Organic disproportionation. Mechanism  Step 1:  Step 2:  Step 3: Table of contents: Results and Discussion: For the 2nd experiment (Synthesis of Benzoin), 1.303g of thiamine hydrochloride was weighed out. Once the mixture was made, we added 3M of NaOH dropwise and the mixture immediately turned lime green and became darker after each drop. While cooling in the ice bath, a cloudy white precipitate was beginning to form, then noticed it going back to a lime green color.

Lab 4 (Cannizaro Reaction)

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