Ethylene-bridged tetramethylcyclopentadienylamide titanium complexes: Ligand synthesis and olefin polymerization properties

被引：50

作者：

van Leusen, D ^{[1
]}

Beetstra, DJ ^{[1
]}

Hessen, B ^{[1
]}

Teuben, JH ^{[1
]}

机构：

[1] Univ Groningen, Stratingh Inst Chem & Chem Engn, Ctr Catalyt Olefin Polymerizat, Dutch Polymer Inst, NL-9747 AG Groningen, Netherlands

来源：

ORGANOMETALLICS | 2000年 / 19卷 / 20期

关键词：

D O I：

10.1021/om000402f

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The N-alkyl-2(2,3,4,5-tetramethylcyclopentadienyl)ethylamines C5Me4H(CH2)(2)NHR (R = i-Pr, t-Bu) were obtained from the reaction of 2,3,4,5-tetramethylcyclopent-2-enone with deprotonated imines LiCH2CH=NR followed by dehydration and reduction using LiAlH4. The parent compound with R = H was obtained via a similar procedure using deprotonated acetonitrile and derivatized to the R = Me species. The Ti(IV) complexes [C5Me4(CH2)(2)NR]TiCl2 (R = t-Bu, i-Pr, Me) were prepared and tested for catalytic propene homopolymerization using methylaluminoxane (MAO) cocatalyst. Surprisingly, the catalysts with R = i-Pr, t-Bu were found to be inactive, and only for R = Me was catalytic formation of atactic polypropene observed. This is in marked contrast with the analogous systems with ligands with a SiMe2-bridge that readily homopolymerize propane under similar conditions.

引用

页码：4084 / 4089

页数：6

共 33 条

[1] SYNTHESIS OF [C5(CH3)4H]CH2CH2CH2P(C6H5)2 - A NOVEL HETERODIFUNCTIONAL LIGAND POSSESSING BOTH A TETRAMETHYLCYCLOPENTADIENE AND A REMOTE DIPHENYLPHOSPHINE FUNCTIONALITY [J].