We have studied the reactivity of rhodium complexes to determine what molecular features drive catalytic activity. This comparative study focused only on thermodynamic effects, as no transition states or energy barriers were evaluated. Obviously, information on the latter would be important to obtain a complete picture of the catalytic cycle in Figure , but we leave this investigation for a future study. In fact, the results reported in this work already provide significant insights on the role of various ligand features on the reactivity, and they are condensed here.