The Ozonolysis mechanism proceeds via an oxidative cleavage reaction. The ozone not only breaks the carbon pi bond but also the carbon-carbon sigma bond. It involves the attack of ozone on the given reactant to form an ozonide. To eliminate the oxygen in this intermediate stage, zinc dust is employed (since it forms zinc oxide with oxygen). The final product varies based on the type of reactant and the workup. Given below is an illustration depicting the general mechanism of the ozonolysis reaction for alkenes and alkynes.
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