After the β-hydrogen have been fully transferred to In atom, the oxidized form of the guanidinate ligand, namely Ox(guan), is pushed away from cmp5 without forming any adduct intermediate. In this case, a double bond is formed between the α-nitrogen (N2) and β-carbon, decreasing the distance between them compared to the ordinary guanidinate. On the other hand, the negative charge is carried by the hydride to form the In-H coordination bond (cmp 5). This so-called β-hydrogen elimination route (R4) is illustrated in Fig. -left.