For the anionic ligands, the vast majority of coordinating atoms are carbons or nitrogens for both the 1 and 2 neutral ligands configurations. Anionic carbon atoms are not the most commonly found coordinating atoms for TMC ligands. For monodentate ligands with carbon coordinating atoms in the tmQMg, the carbene coordinating environments are dominating . However, we looked at the neutral monodentates in the tmQMg-L and found that there are 327 ligands where the coordinating atom is an anionic carbon which supports the use of these carbanion ligands in our approach. How this analysis was done is explained in section S7 in the SI. Subsequently we will look further into the 3D structures and reaction profiles of the catalysts from Figure . All catalyst reaction profiles are compared to the Schrock catalyst reaction profiles calculated at the same level of theory (S5.1).