At this level, it is important to note that we found many difficulties in the location of the reactant complex in the entrance channel and we assume that they are related with the flatness of the PES in this region. Finally, to improve the energetic description, the singlepoint technique was used, i.e., based on previous optimized geometries, the energy is improved using the explicitly correlated method with a larger basis set, CCSD(T)-F12/aug-cc-pVTZ. The ab initio calculations were performed using the Gaussian16 and Molpro 17 codes.