Ozonolysis of 2, 3-dimethyl-1-butene gives methanal and 3-methyl-2-butanone as major product. Ozonolysis is a reaction in which unsaturated bonds of alkene are cleaved by ozone (O3) in presence of Zn∕H2O to give carbonyl compounds.
Mechanism Step 1 Nucleophilic mC=C attacks the positive [O] of ozone while negative [O] of ozone attack other end of C=C.
Step 2 The cyclic molozonide rearranges itself to ozonide.
Step 3 In last step, ozonide decompose to form carbonyl compounds in presence of Zn∕H2O.