The effects produced by static and homogeneous external electric fields (EEFs) were studied using the "Field = M ± N" keyword in Gaussian 16, where M defines the axis of the EEF, ± the direction of the field along the axis, and N its magnitude. EEF strengths in the range [-0.1; +0.1] V/Å were explored. EEFs were applied along the direction of formation of the C-C bond, which we aligned along the Z-axis of our reference system, and along orthogonal directions, namely X, and Y (Figure ).