Initiated and inhibited oxidation of 2-methyl-2-vinyl-gem-dichlorocyclopropane has been studied. It has been found that in the oxidation process, chain propagation occurs via the addition of a polyperoxy radical to the double bond. The studied monomer is close to methacrylic acid esters in activity. The inhibiting effect of phenol and amine antioxidants and stable nitroxyl radicals on the radical chain oxidation of 2-methyl-2-vinyl-gem-dichlorocyclopropane has been examined, and amines and nitroxyls have been shown to repeatedly terminate chains due to the regeneration of the inhibitor.