This reaction gives linear polymers in which the two monomer residues are connected alternately along the entire polymer chain. A part from this reaction, a possible competing reaction is the interchange reaction that leads to randomization of reactants residues or intrachange reaction that leads to the formation and subsequent elimination of cyclic aliphatic carbonates from the oligomers or the preformed polymers.The occurrence of this reaction would lead to the formation of shorter polymer chains and lower viscosity