Evaluation criteria. The energy barrier for the C -H cleavage (∆E ‡ ) was computed for all gallium imides in order to find the most reactive systems for nonpolar C -H bonds. In addition, we evaluated the overall reaction energy of the C -H activation (∆E rxn ). An excessively exothermic reaction will preclude further chemical transformations of the activation products. These two considerations are typically mutually contradictory, as the Bell-Evans-Polanyi principle states that lower activation barriers for a given reaction correspond to more exothermic processes. Finally, the stability of the gallium imides against spontaneous dimerization (∆E dim ) was also estimated, as it is expected that the imide monomers which form strong Ga -N bonds in a dimer are not reactive on C -H bonds of interest.