573984-24-4

Upstream product

• 10361-91-8 ytterbium(III) chloride 
• 12128-56-2 potassium indenyl 
• 223414-22-0 Li(2,6-iPr₂C₆H₃)NC(Me)CHC(Me)N(2,6-iPr₂C₆H₃) 

Downstream Products

• 573984-27-7 (η(5)-indenyl)(N,N'-diisopropylphenyl-2,4-pentanediimine)Yb(THF) 

Relevant academic research and scientific papers

Ytterbium complexes supported by β-diketiminate ligands: Cyclopentadienyl, indenyl, and aryloxide derivatives

Reactions of β-diketiminate ytterbium dichloride, LYbCl2(THF)2 (L = N,N-2,6-diisopropylphenyl-2,4-pentanediimine anion), with C5H5Na, in 1:1 or 1:2 molar ratio in tetrahydrofuran (THF) at room temperature give the mixed-ligand ytterbium complexes (C5H5)(L)YbCl (1) and (C5H5)2YbL (2), respectively. LYbCl2(THF)2 reacts with C9H7K or ArONa (ArO = 2,6-BU2t-4-MeC6H2O) in 1:1 molar ratio in THF to afford (C9H7)(L)YbCl (3) and (ArO)(L)YbCl(THF) (4) in high yield, respectively. Crystal structure analysis revealed that complex 3 is an unsolvated monomer, in which the ytterbium atom is coordinated by one indenyl ring, two nitrogen atoms of the diketiminate ligand and one chlorine atom, while complex 4 is a THF solvated monomer with the central metal five-coordinated by two nitrogen atoms, two oxygen atoms, and one chlorine atom.

Synthesis and structural characterization of divalent ytterbium complexes supported by β-diketiminate ligands and their catalytic activity for the polymerization of methyl methacrylate

Three divalent ytterbium complexes supported by a β-diketiminate ligand were synthesized for the first time. The mixed-ligand ytterbium chlorides (CH3C5H4)[(DIPPh)2nacnac]YbCl (1), (C9H7)[(DIPPh)2nacnac]YbCl (2), and (ArO)[(DIPPh)2nacnac]YbCl(THF) (3) ((DIPPh)2nacnac = N,N-diisopropylphenyl-2, 4-pentanediimine anion, ArO = 2,6-di-tert-butyl-4-methylphenoxo), which were obtained in high yield by using [(DIPPh)2nacnac] YbCl2(THF)2 as precursor, were reduced by Na/K alloy in THF to afford the corresponding divalent species (CH3C5H4)[(DIPPh)2nacnac]Yb(THF) (4), (C9H7)[(DIPPh)2nacnac]Yb(THF) (5), and {(ArO)-[(DIPPh)2nacnac]Yb(THF)}(THF) (6), respectively. Complexes 2-6 were well characterized, and crystal structures of complexes 4-6 were determined. These divalent complexes exhibit good catalytic activity for the polymerization of methyl methacrylate.