Question

What is ozonolysis and its applications?

Answer 1

Ozonolysis is a redox reaction involving `"O"_3` and alkenes. An important application is the synthesis of ketones.

Explanation:

In the presence of oxidising agents, alkenes can turn into alcohols, aldehydes, ketones or carboxylic acids.

In ozonolysis, ozone (`"O"_3`) is bubbled through a solution of the alkene in methanol at −78 °C, until the solution turns blue (which is due to excess unreacted ozone).

The intermediate formed at the end of the ozonolysis reaction is called an ozonide. To obtain the ketone/aldehyde products, zinc or dimethyl sulfide (reducing agent) is added.

A general overall reaction is shown below.