Reactions in which one of the intermediate or end products of the reaction can act as catalysts in the reaction that is called autocatalytic reactions. In this case the catalyst is supplied by himself reactant system. Under certain conditions, autocatalytic reactions may occur in an uncontrolled regime, exploded. In many complex systems, the existence of autocatalytic reaction leads to periodic oscillations of the concentrations of certain intermediates. Autocatalytic phenomena can occur in homogeneous systems and in heterogeneous systems. Autocatalytic reactions taking place in a homogeneous reaction taking place as a singular, it realized a decrease, an increase, monotonous concentration of reactants and reaction products. In such a system of periodic oscillations can not occur concentrations of chemical species, so there may be a temporal sequence?