“…The feature of the polymerization initiation by vanadium(V) salts is the necessity of the preliminary introduction of easily oxidized groups into the polymer-base due to a low redox potential [114]. Among the variable valence metal compounds, cobalt(ІІІ) salts are characterized by the highest redox potential, however, in the соpolymerization process they can also initiate the homopolymerization of, e.g., vinyl monomers [115] or lead to a destruction of the main chain of polysaccharides [115][116][117][118].…”