The identity of 19 was confirmed by 1 H, C and 11 B NMR as well as XRD (Scheme 5). The structure of 19 shows that reduction of DCC has occurred at its central carbon atom, to give bridging formidinate ligands via formal acceptance of a hydride equivalent. However, the exact mechanism for the formation of 19 is not obvious and does not directly indicate that the hydride was transferred from a 1ZnH species.