Exotic phenomena in the deterministic model of complex chemical reactions are studied on the basis of preliminarily reported results. It is shown that the absence of a special kind of autocatalysis, autoinhibition and cooperativity implies the existence of a unique, asymptotically stable, positive equilibrium point. The class of chemical reactions with gradient system as its deterministic model is delineated. A procedure is given for the construction of oscillatory reactions. A neurobiological application of one of the constructed models is shown.