Methanetrisamidines HC[C(NR)NHR]3} (R = i-Pr 1a; Ph 1b) were reacted with different metal complexes. Reaction of 1a with NiCl2(H2O)6 occurred with protonation of 1a and formation of [C(C(NHi-Pr)2)3]2+[NiCl4]2−} 2, whereas the reaction with CuCl gave [C(C(N(i-Pr)CuCl)NHi-Pr)2(C(NHi-Pr)2)] 3. The formation of 2 and 3, which contain the N–H tautomeric form of 1a, occurred with H-migration from carbon
different acidity of the four N–H groups also allowed the stepwisemetalation of 1c by two different metal organic complexes with the formation of the heterobimetalliccomplexes 5a and 5b. In addition, transmetalation by Zn/Al exchange was observed in the reaction of 3c with AlMe3, yielding the corresponding dinuclear aluminium complex 3a. The complexes were characterized by NMR and IR spectroscopy and single-crystal
Tout au contraire: Both tautomeric forms of a methanetrisamidine were structurally characterized for the first time by X‐ray diffraction and by ab initio calculations (see structures; gray C, red H, blue N). Their reactivity as proton acceptors and multianionic ligands was demonstrated.