Synthesis and Structural Characterization of Zirconium−Carboryne Complexes
作者:Shikuo Ren、Liang Deng、Hoi-Shan Chan、Zuowei Xie
DOI:10.1021/om900504g
日期:2009.10.12
A series of Zr-carboryne (carboryne = 1,2-dehydro-1,2-carborane) complexes were prepared and fully characterized. Both the electronic and steric factors of the ligands have significant effects on the formation of the resultant metal complexes. The reaction of organozirconium dichloride with 1 equiv of Li2C2B10H10 gave a new class of zirconium-carboryne complexes, including (eta(2)-C2B10H10)ZrCl2-(THF)(3) (6). Treatment of 6 with 2 equiv of amidinatolithium, guanidinatolithium, or 'BuOK afforded the complex [eta(2)-CyNC(CH3)NCy](2)Zr(eta(2)-C2B10H10) (4), [eta(2)-(Pr2NC)-Pr-n(NPri)(2)](2)Zr(eta(2)-C2B10H10) (7), or [(eta(2)-C2B10H10)(2)Zr(O'Bu)(THF)][Zr(OBu')(3)(THF)(3)] (8). The unexpected product [sigma:sigma:sigma-'BuC(O)=CHC('Bu)(O)C2B10H10}]Zr(eta(2)-'BuCOCHCOBu')(THF)(2) (9) was isolated from the reaction of 6 with ('BuCOCHCO'Bu)Na. All complexes were fully characterized by H-1, C-13, and B-11 NMR techniques as well as elemental analyses, Their structures were further confirmed by single-crystal X-ray analyses.
Bulky Bis(alkylamidinate) Complexes of Group 4. Syntheses and Characterization of M(CyNC(R‘)NCy)<sub>2</sub>Cl<sub>2</sub> and Zr(CyNC(Me)NCy)<sub>2</sub>Me<sub>2</sub> (R‘= Me, M = Ti, Zr, Hf; R‘ = <sup>t</sup>Bu, M = Zr)
作者:Adam Littke、Nassrin Sleiman、Corinne Bensimon、Darrin S. Richeson、Glenn P. A. Yap、Stephen J. Brown
DOI:10.1021/om9707533
日期:1998.2.1
Synthesis of a series of bis(alkylamidinate) group 4 compounds of the general formula M(CyNC(CH3)NCy)(2)Cl-2 (M = Ti (1), Zr (2), Hf (3); Cy = cyclohexyl), Zr(CyNC(CMe3)NCy)(2)Cl-2 (4), and Zr(CyNC(CH3)NCy)(2)(CH3)(2) (5) are reported. In the presence of methylaluminoxane (MAO) as a cocatalyst, compounds 1-5 are active ethylene polymerization catalysts.