Formation of trivalent zirconocene complexes from ansa-zirconocene-based olefin-polymerization precatalysts: an EPR- and NMR-spectroscopic study.
Formation of trivalent zirconocene complexes from ansa-zirconocene-based olefin-polymerization precatalysts: an EPR- and NMR-spectroscopic study.
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由柄型二茂锆基烯烃聚合预催化剂形成三价二茂锆配合物:EPR 和 NMR 光谱研究
DOI:
10.1021/ja403170u
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发表时间:
2013
影响因子:
15
通讯作者:
Hans H.
中科院分区:
文献类型:
--
作者:
Lenton;Taylor N;Bercaw;John E;Panchenko;Valentina N;Zakharov;Vladimir A;Babushkin;Dmitrii E;Soshnikov;Igor E;Evgenii P;Brintzinger;Hans H.
Reduction of Zr(IV) metallocenium cations with sodium amalgam (NaHg) produces EPR signals assignable to Zr(III) metallocene complexes. The chloro-bridged heterodinuclearansa-zirconocenium cation [(SBI)Zr(μ-Cl)2AlMe2]+(SBI =rac-dimethylsilylbis(1-indenyl)), present in toluene solution as its B(C6F5)4–salt, thus gives rise to an EPR signal assignable to the complex (SBI)ZrIII(μ-Cl)2AlMe2, while (SBI)ZrIII-Me and (SBI)ZrIII(μ-H)2AliBu2are formed by reduction of [(SBI)Zr(μ-Me)2AlMe2]+B(C6F5)4–and [(SBI)Zr(μ-H)3(AliBu2)2]+B(C6F5)4–, respectively. These products can also be accessed, along with (SBI)ZrIII-iBu and [(SBI)ZrIII]+AlR4–, when (SBI)ZrMe2is allowed to react with HAliBu2, eliminating isobutane en route to the Zr(III) complex. Further studies concern interconversion reactions between these and other (SBI)Zr(III) complexes and reaction mechanisms involved in their formation.
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DOI:
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发表时间:
1998
期刊:
影响因子:
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作者:
W. Lukens;P. Matsunaga;R. Andersen
通讯作者:
R. Andersen
DOI:
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发表时间:
1993
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作者:
Anne;R. Choukroun;J. Jaud
通讯作者:
J. Jaud
DOI:
--
发表时间:
1999
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作者:
R. Wehmschulte;P. Power
通讯作者:
P. Power
DOI:
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发表时间:
1998
期刊:
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作者:
A. Grassi;S. Saccheo;A. Zambelli;F. Laschi
通讯作者:
F. Laschi
DOI:
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发表时间:
1994
期刊:
影响因子:
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作者:
D. Cam;F. Sartori;A. Maldotti
通讯作者:
A. Maldotti