757952-11-7

Upstream product

• 482323-03-5 lithium N,N'-bis(2,6-dimethylphenyl)-2,4-pentanediiminate 
• 10024-93-8 neodymium trichloride 

Relevant academic research and scientific papers

β-diketiminato rare-earth metal complexes. Structures, catalysis, and active species for highly cis -1,4-selective polymerization of isoprene

Lithiation of the β-diketimines (2,6-C6H3R 2)NH - C(Me)CH - C(Me)N(2,6-C6H3R2) (R = Me (HL1), Et (HL2)) by nBuLi was followed by metathesis reaction with LnCl3(THF)x and Y(BH 4)3(THF)2 to afford the corresponding complexes L1LnCl2(THF)2 (Ln = Gd (1), Nd (3), Dy (4), Er (5), Y (6)), L2GdCl2(THF)2 (2), and L 1Y(BH4)2(THF) (8), respectively. Treatment of neutral HL1 with Y(CH2SiMe3) 3(THF)2 generated the bis(alkyl) complex 7, L 1Y(CH2SiMe3)2(THF). Upon activation with [PhNHMe2][B(C6F5)4] and AliBu3, complex 6 showed the highest cis-1,4 selectivity (99.3%, Tp = 0 °C) toward the polymerization of isoprene, while complex 7 had a comparatively low cis-1,4 selectivity, and in contrast, complex 8 was completely inert. The influences of the ortho substituents of the N-aryl rings of the ligands, the types of central metals and cocatalysts, and addition sequence of the catalyst components had been thoroughly investigated. By means of X-ray diffraction and 1H NMR spectroscopy analyses, the intermediates arising from the stoichiometric reactions among the catalyst components and the probable active species were elucidated, which facilitates further investigation of the mechanism for diene polymerization.

The salt-free diamido complexes of lanthanide supported by β-diketiminate: Synthesis, characterization, and their catalytic activity for the polymerization of acrylonitrile and ε-caprolactone

The synthesis and structure of the salt-free diamido complexes of lanthanide supported by β-diketiminate ligand (2,6-Me2C 6H3)NC(Me)CHC(Me)N(2,6-Me2C6H 3) are described. The β-diketiminate lanthanide dichloride LLnCl2(THF)2 (L = N,N′-bis(2,6-dimethylphenyl)-2,4- pentanediiminate) [Ln = Yb (1), Nd (2)] was prepared by the metathesis reaction of LLi with anhydrous LnCl3 in a 1:1 molar ratio in THF at room temperature. Reactions of 1 and 2 with 2 equiv. of LiNPh2 in THF gave the salt-free complex LLn(NPh2)2(THF) [Ln = Yb (3), Nd (4)] in good yield as crystalline solids. Both compounds were characterized crystallographically. The coordinated geometry around the central metal can be described as a distorted trigonal bipyramid. Complexes 3 and 4 showed good catalytic activity for the polymerization of acrylonitrile and high activity for the ring-opening polymerization of ε-caprolactone at room temperature.

Synthesis, characterization and structural diversity of lanthanide chlorides supported by the β-diketiminate ligand [{(2,6-Me 2C6H3)NC(Me)}2CH]-

Reactions of the β-diketiminate lithium salt L2Li [L 2={(2,6-Me2C6H3)NC(Me)} 2CH] with anhydrous LnCl3 (Ln=Yb, Sm, Nd) in 1:1 molar ratio in THF afforded the new β-diketiminate l