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Ozonolysis is a type of cycloaddition which destroys bonds. It starts with a 1,3-dipolar cycloaddition but eventually becomes a method of cleaving π bonds in an oxidative fashion, so that they end up as two carbonyl groups. The reagent for this reaction is ozone, O3.

T. J. Fisher and P. H. Dussault, Tetrahedron, 2017, 73, 4233–4258.