Synthesis of neutral and cationic monocyclopentadienyl alkyl niobium and tantalum complexes

被引：4

作者：

Sanchez-Nieves, Javier ^{[1
]}

Tabernero, Vanessa ^{[1
]}

Camejo, Claudimar ^{[1
]}

Royo, Pascual ^{[1
]}

机构：

[1] Univ Alcala de Henares, Dept Quim Inorgan, E-28871 Alcala De Henares, Madrid, Spain

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2010年 / 695卷 / 22期

关键词：

Monocyclopentadienyl; Cationic compounds; Niobium compounds; Alkyl compounds; Methylmethacrylate polymerization; RAY CRYSTAL-STRUCTURE; METHYL-METHACRYLATE POLYMERIZATION; PYRAMIDAL INVERSION BARRIERS; ORGANO-LEWIS-ACIDS; METAL-CARBON BONDS; MOLECULAR-STRUCTURE; DYNAMIC-BEHAVIOR; INSERTION; REACTIVITY; IMIDO;

D O I：

10.1016/j.jorganchem.2010.06.030

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Compound [NbCp'Me-4] (Cp' - eta(5)-C5H4SiMe3, 1) reacted with several ROH compounds (R - tBu, SiiPr(3), 2,6-Me2C6H3) to give the derivatives [NbCp'Me-3(OR)] (R = tBu 2a, SiiPr(3) 2b, 2,6-Me2C6H3 2c). The diaryloxo tantalum compound [TaCp*Me-2(OR)(2)] (Cp* = eta(5)-C5Me5, R = 2,6-Me2C6H3 3) was obtained by reaction of [TaCp*Cl2Me2] with 2 equiv of LiOR (R = 2,6-Me2C6H3). Abstraction of one methyl group from these neutral compounds 1-3 with the Lewis acids E(C6F5)(3) (E = B, Al) gave the ionic derivatives [NbCp'Me2X][MeE(C6F5)(3)] (X = Me 4-E X = OR; R = SiiPr(3) 5b-E, 2,6-Me2C6H3 5c-E E = B, Al) and [TaCp*Me(OR)(2)][MeE(C6F5)(3)] (R = 2,6-Me2C6H3 6-E; E = B, Al). Polymerization of MMA with the aryloxoniobium compound 2c and Al(C6F5) 3 gave syndiotactic PMMA in a low yield, whereas the tetramethylniobium compound 1 and the diaryloxotantalum derivative 3 were inactive. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：2469 / 2473

页数：5

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