The comparison between ΔrH of the first, second and third elimination processes shows that they are almost equal in the dechelation step (R1a/R2a/R3a), where ΔrH= 41-48 kJ/mol. The migration is slightly less endothermic, by ~25 kJ/mol, for the second (R2b) and third migration (R3b) steps compared to the first case (R1b). The largest difference in energy is for the adduct release step (R1c/R2c/R3c), where ΔrH lies between 22-79 kJ/mol. Comparing the first and second decomposition steps, the adduct release is slightly more endothermic in the latter, again by ~25 kJ/mol, mostly cancelling out the difference from the migration step, and resulting in an almost equal overall change of enthalpy for these steps. In the third decomposition, the adduct release has a larger increase of enthalpy that leads to a much more endothermic process. These differences agree with the changes in the adduct structure, in which the less crowded structures allow the adduct to reach the indium atom and coordinate to it.