It forms a very stable complex of the [Ru]=CHOEt type and ensures the functionalization of the polymer end-group.
The strain energy of the cycle releasing during the decomposition of the metal-cyclobutane complex and maintaining the forward direction of the reaction.
However, if the deformation energy of cycle is low, the contribution of the entropy factor into the Gibbs energy becomes more significant in comparison with a smaller enthalpy factor.
Intermolecular and intramolecular chain transfers are two main side reactions of ROMP (Scheme 2).
During the intermolecular transferring, the active metal-carbene complex located at the end of one macromolecule interacts with the double bond of the adjoined macromolecule, which leads to fragment exchange process.