title: Rare-earth metal bis(silylamide) complexes supported by mono-dentate arylamido ligand: synthesis, reactivity, and catalyst precursors in living cis-1,4-selective polymerization of isoprene.
abstract: The salt metathesis reaction of LnCl3 with 1 equivalent of arylamido lithium [2,6-(i)Pr2C6H3N(SiMe3)]Li followed by addition of 2 equivalents of LiN(SiHMe2)2 in THF at room temperature obtained neutral mono-arylamido-ligated rare-earth metal bis(silylamide) complexes [2,6-(i)Pr2C6H3N(SiMe3)]Ln[N(SiHMe2)2]2(THF) (Ln = Y (), Lu (), La ()) in good isolated yields. Treatment of with excess AlMe3 produced the mono(arylamido) Ln/Al heterotrinuclear methyl complexes [2,6-(i)Pr2C6H3N(SiMe3)]Ln[(μ-Me)2AlMe2]2 (Ln = Y (), Lu (), La ()) via amide-alkyl exchange. All these complexes were well-characterized by elemental analysis, NMR spectroscopy and FT-IR spectroscopy. , and were further structurally authenticated by X-ray crystallography. In the presence of [Ph3C][B(C6F5)4] and Al(i)Bu3, were highly active for cis-1,4-selective polymerization of isoprene, whereas /[Ph3C][B(C6F5)4]/Al(i)Bu3 promoted the polymerization in a living fashion.
authors.affiliation: Ningbo Polytechnic, Ningbo 315800, P. R. China and Zhejiang University of Technology, Hangzhou 310032, P. R. China.
authors.forename: Liqin
authors.initials: L
authors.lastname: Shi
authors.affiliation: Organometallic Chemistry Laboratory, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, P. R. China. lyj@nit.zju.edu.cn.
authors.forename: Qi
authors.initials: Q
authors.lastname: Su
authors.affiliation: Organometallic Chemistry Laboratory, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, P. R. China. lyj@nit.zju.edu.cn.
authors.forename: Jue
authors.initials: J
authors.lastname: Chen
authors.affiliation: Zhejiang University of Technology, Hangzhou 310032, P. R. China.
authors.forename: Xiaonian
authors.initials: X
authors.lastname: Li
authors.affiliation: Organometallic Chemistry Laboratory, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, P. R. China. lyj@nit.zju.edu.cn.
authors.forename: Yunjie
authors.initials: Y
authors.lastname: Luo