The features of the catalytic decomposition of cumene hydroperoxide (CHP) were studied by the pulse technique in an inert gas atmosphere over the temperature range 90-120A degrees C and the concentration range 0.1-2.5 mol/l. As a catalyst, molybdenum(VI) oxo-peroxo compounds active in the olefin oxidation reaction were used, which were prepared from cumene hydroperoxide and hydrogen peroxide. The rate and activation parameters for the formation and degradation of the CHP-catalyst complex were determined, as well as the thermodynamic characteristics of complexation.