Abstract
The synthesis, structures, and reactivity of new lanthanocene complexes incorporating amidinate ligand [tBuNC(nBu)NtBu] are described. Treatment of Cp2LnnBu (Ln = Er (1), Y (2), Gd (3)) with N,N‘-di-tert-butylcarbodiimide results in monoinsertion of carbodiimide into the Ln−C σ-bond to yield the title compounds Cp2Ln[tBuNC(nBu)NtBu] (Ln = Er (4), Y (5), Gd (6)). Complexes 4−6 were characterized by elemental analysis and IR and mass spectroscopies. The structures of complexes 4 and 5 were determined through X-ray single-crystal diffraction analysis. It is shown that compound 5 is a fine catalyst for cyclotrimerization of phenyl isocyanate.
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