The kinetics and mechanism of thermal decomposition of adamantyl-containing organosilicon peroxides in a solution in n-nonane were studied. The relationship between the structure of the peroxide and the rate and mechanism of thermalysis was established. The effect of the peroxide structure on the electronic characteristics of the peroxide band was studied by the MNDO method. The heterolytic rearrangement occurring during the decomposition of peroxides was analyzed.