1034645-76-5Relevant academic research and scientific papers
Synthesis, characterization, and catalytic activity of rare earth metal amides supported by a diamido ligand with a CH2SiMe2 link
Wu, Yunjun,Wang, Shaowu,Zhu, Xiancui,Yang, Gaosheng,Wei, Yun,Zhang, Lijun,Song, Hai-Bin
, p. 5503 - 5511 (2009/02/05)
A series of four coordinate rare earth metal amides with general formula {(CH2SiMe2)[2,6-iPr2C 6H3)N]2}LnN(SiMe3)2(THF) [(Ln = Yb(2), Y (3), Dy (4), Sm (5), Nd (6)] containing a diamido ligand (CH2SiMe2)[(2,6-iPr2C 6H3)N]22- with a CH 2SiMe2 link were synthesized in good yields via reaction of [(Me3Si)2N]3LnIII(μ-Cl)Li(THF) 3 with the corresponding diamine (CH2SiMe 2)[(2,6-iPr2C6H3)NH] 2 (1). All compounds were fully characterized by spectroscopic methods and elemental analyses. The structures of complexes 2, 3, 4, 5, and 6 were determined by single-crystal X-ray analyses. Investigation of the catalytic properties of the complexes indicated that all complexes exhibited a high catalytic activity on the cyclotrimerization of aromatic isocyanates, which represents the first example of cyclopentadienyl-free rare earth metal complexes exhibiting a high catalytic activity and a high selectivity on cyclotrimerization of aromatic isocyanates. The temperatures, solvents, catalyst loading, and the rare earth metal effects on the catalytic activities of the complexes were examined.
