In the first part of the experiment, benzaldehyde
disproportionates under the effect of alkalis to alcohol-soluble
benzyl alcohol and water-soluble benzoic acid that precipitates
when the aqueous solution is acidified. In the second part,
benzaldehyde reacts with ethylene glycol to form a cyclic acetal.
This ethylene acetal is resistant against basic and oxidising
reagents. In an acid medium, it once again splits up into its
original products. It is because of these characteristics that
cyclic acetals are used for blocking the carbonyl function in
preparative, organic chemistry.
- Experiment including Abbe refractometer
- Controlled and safe heating via heating mantle and power regulator
- Secure connection of the items by GL screw joint system
- Show the Cannizzaro reaction of benzaldehyde under basic
- Prepare benzaldehyde ethylene acetal from benzaldehyde
with ethylene glycol.
What you can learn about
- Cannizzaro reaction
- Micro distillation
- Precision balance 620g/0.001g