The second decomposition could then occur in a similar fashion, but the consecutive decomposition steps lead to a less crowded molecule that, ultimately, allows the CDI-adduct to stay much closer to the indium atom in comparison with the first decomposition. In this sense, the N2-In coordination bond distance is reduced from 4.06 Å, in the first decomposition, to 2.97 and 2.35 Å for the second and last decomposition steps, respectively. In an alternative mechanism, the β-carbon from an isopropyl group bears a hydrogen atom (H1) that is susceptible to be transferred to the metal center in a hydride (H -) form. However, this transfer cannot not occur directly due to the steric hindrance of the closely packed ligands, and the long distance between the atoms. For this reason, this process requires that one ligand is dechelated, similarly to the first step in the elimination mechanism (step R1a).