N,N'-Diisopropyl-N' '-bis(trimethylsilyl)guanidinate Ligand as a Supporting Coordination Environment in Yttrium Chemistry. Synthesis, Structure, and Properties of Complexes [(Me
详细信息 查看全文
- 作者：Dmitrii M. Lyubov ; Georgy K. Fukin ; Alexander A. Trifonov
- 刊名：Inorganic Chemistry
- 出版年：2007
- 出版时间：December 24, 2007
- 年：2007
- 卷：46
- 期：26
- 页码：11450 - 11456
- 全文大小：124K
- 年卷期：v.46,no.26(December 24, 2007)
- ISSN：1520-510X
文摘
The reaction of anhydrous YCl3 with an equimolar amount of lithium N,N'-diisopropyl-N' '-bis(trimethylsilyl)guanidinate,Li[(Me3Si)2NC(Ni-Pr)2], in tetrahydrofuran (THF) afforded the monomeric monoguanidinate dichloro complex {(Me3Si)2NC(Ni-Pr)2}YCl2(THF)2 (1). Alkylation of complex 1 with 2 equiv of LiCH2SiMe3 in hexane at 0 C yielded themonomeric salt-free dialkyl complex {(Me3Si)2NC(Ni-Pr)2}Y(CH2SiMe3)2(THF)2 (2). The bis(triethylborohydride) complex[(Me3Si)2NC(Ni-Pr)2]Y[(-H)(-Et)2BEt]2(THF) (5) was prepared by the reaction of complex 1 with 2 equiv of LiBEt3Hin a toluene-THF mixture at 0 C. The complexes 1, 2, and 5 were structurally characterized. Complex 2 as wellas the systems 2-Ph3B, 2-Ph3B-MAO, and 1-MAO (MAO = methylaluminoxanes) in toluene were inactive inethylene polymerization, while the product obtained in situ from the reaction of complex 2 with a 2-fold molarexcess of PhSiH3 in toluene polymerized ethylene with moderate activity.