Niobium and Zirconium Complexes Incorporating Asymmetrically Substituted ansa Ligands. X-ray Crystal Structures of [Me2Si(
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- 作者：Antonio Antiñ ; olo ; Isabel Ló ; pez-Solera ; Irache Orive ; Antonio Otero ; Sanjiv Prashar ; Ana M. Rodrí ; guez ; and Elena Villaseñ ; or
- 刊名：Organometallics
- 出版年：2001
- 出版时间：January 8, 2001
- 年：2001
- 卷：20
- 期：1
- 页码：71 - 78
- 全文大小：128K
- 年卷期：v.20,no.1(January 8, 2001)
- ISSN：1520-6041
文摘
The asymmetric ansa-ligand precursors (C5Me4H)SiMe2(C5H4R) (R = H (1), Me (2), SiMe3(3), iPr (4)) and their lithium derivatives [Me2Si(C5Me4)(C5H3R)]Li2 (R = H (5), Me (6), SiMe3(7), iPr (8)) have been prepared. The ansa-niobocene imido complexes [Me2Si(
5-C5Me4)(5-C5H3R)]Nb(=NtBu)Cl (R = H (9), Me (10), SiMe3 (11), iPr (12)) were synthesized by thereaction of Nb(=NtBu)Cl3(py)2 with [Me2Si(C5Me4)(C5H3R)]Li2 in THF. The ansa-zirconocenecomplexes [Me2Si(5-C5Me4)(5-C5H3R)]ZrCl2 (R = H (13), Me (14), SiMe3 (15), iPr (16)) wereprepared by the reaction of ZrCl4 and the corresponding lithiated ansa-derivative. Themolecular structures of 10, 12, 13, and 14 were determined by single-crystal X-ray diffractionstudies. Preliminary results for the catalytic activity of 13-16 in the polymerization ofethylene are reported.
5-C5Me4)(5-C5H3R)]Nb(=NtBu)Cl (R = H (9), Me (10), SiMe3 (11), iPr (12)) were synthesized by thereaction of Nb(=NtBu)Cl3(py)2 with [Me2Si(C5Me4)(C5H3R)]Li2 in THF. The ansa-zirconocenecomplexes [Me2Si(5-C5Me4)(5-C5H3R)]ZrCl2 (R = H (13), Me (14), SiMe3 (15), iPr (16)) wereprepared by the reaction of ZrCl4 and the corresponding lithiated ansa-derivative. Themolecular structures of 10, 12, 13, and 14 were determined by single-crystal X-ray diffractionstudies. Preliminary results for the catalytic activity of 13-16 in the polymerization ofethylene are reported.