944128-27-2Relevant academic research and scientific papers
Synthesis of the first rare earth metal bis(alkyl)s bearing an indenyl functionalized N-heterocyclic carbene
Wang, Baoli,Wang, Dun,Cui, Dongmei,Gao, Wei,Tang, Tao,Chen, Xuesi,Jing, Xiabin
, p. 3167 - 3172 (2007)
Treatment of indenyl-modified imidazolium bromide [C9H 7CH2CH2(NCHCHN(C6H 2Me3-2,4,6)CH)-Br] ((IndH-NHC-H)Br) with rare earth metal tetra(alkyl) lithium (Ln(CH2SiMe3)4Li(THF) 4) or with (trimethylsilylmethyl)lithium (LiCH2SiMe 3) and rare earth metal tris(alkyl)s (Ln(CH2SiMe 3)3(THF)2) sequentially afforded the first NHC-stabilized monomeric rare earth metal bis(alkyl) complexes (Ind-NHC)Ln(CH2SiMe3)2 (1, Ln -Y; 2, Ln = Lu; 3, Ln = Sc) via double-deprotonation reactions. Complexes 1-3 are THF-free isostructural monomers. The monoanionic Ind-NHC species bond to the central metal ion in a η5:κ1 constrained geometry configuration (CGC) mode, which combine with the two cis-located alkyl moieties to form a tetrahedron ligand core, leading to the chirality of the complexes. Under the presence of activators AlEt3 and [Ph3C][B(C 6F5)4], complex 2 showed catalytic activity toward the polymerization of isoprene to afford 3,4-regulated polyisoprene (91%).
