At the same time, the results for the ligands without phenyl groups, Figures and, have shown that bulky substituents can significantly influence the reactivity, with effects that are also larger than that of the bite angle. Hence, controlling the reactivity is easier when small substituent groups are employed. Another potential factor is the tilt angle ϕ of the Cp * ligand on the Rh. This angle is difficult to control experimentally, given the somewhat looser interaction between the metal and the Cp * ring. Our calculations indicate that ϕ can be influenced by bulky substituents on the ligands, but overall the actual ϕ value does not seem to directly correlate with the reaction energy.