双负离子胍基稀土锂配合物：催化胺和二亚胺加成的反应的高效催化剂

series of heterobimetallic dianionic guanidinate complexes of lanthanide and lithium, [Li(THF)(DME)]3Ln[μ-η2η1(iPrN)2C(NC6H4p-R)]3 [R = Cl, Ln = Nd (I), Y (II), La (III); R = H, Ln = Nd (IV)] were synthesized and fully characterized. These complexes were found to be highly efficient precatalysts for the addition of various primary and secondary amines, and aromatic and aliphatic diamines to carbodiimides to the corresponding monoguanidine and biguanidine derivatives under mild condition (at 25-40 oC), which provides an efficient way for the synthesis of biguanidines compounds. The activity depends on the central metals and ligands: La > Nd > Y for metals and [(iPrN)2C(NC6H4p-Cl)]2- > [(iPrN)2C(NC6H5)]2- for ligands around lanthanide ion were observed.