.beta.-Alkyl transfer in a lanthanide model for chain termination

Watson, Patricia L.; Roe, Diana C.

doi:10.1021/ja00387a064

Cited by 223 publications

(118 citation statements)

References 0 publications

Supporting

Mentioning

107

Contrasting

Unclassified

Order By: Relevance

“…After the pioneer work of Ballard [5] and Watson [6], Marks reported in 1985 that lanthanide hydrides (Cp* 2 LnH) 2 (Cp* = C 5 Me 5 ), and particularly those of early lanthanides (La, Nd, Sm) display a tremendous activity towards ethylene polymerisation [7]. This activity, extremely high according to Gibson's scale [8], could be compared to that of homogeneous Ziegler Natta group 4 catalysts.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and X-ray structure of a borohydrido metallocene of neodymium and its use as pre-catalyst in Nd/Mg dual-component ethylene and isoprene polymerisations

Visseaux

Chenal

Roussel

et al. 2006

Journal of Organometallic Chemistry

View full text Add to dashboard Cite

Cp* 2 Nd(BH 4 )(THF) (1) (Cp* = C 5 Me 5 ) has been readily obtained in one step from Nd(BH 4 ) 3 (THF) 3 and fully characterized by 1 H NMR, IR spectroscopy, and elemental analysis. Its X-Ray structure displays a neutral monomeric complex, bearing one slightly distorted terminal BH 4group. Associated to nBuEtMg, 1 affords a highly active catalyst for ethylene polymerisation, the first one prepared from a borohydrido organolanthanide pre-catalyst. In the same experimental conditions, the catalytic behaviour of 1 is similar to that of previously described Cp* 2 NdCl 2 Li(Et 2 O) 2 (2). The 1/nBuEtMg system is not deactivated even in the presence of large excesses of THF. In contrast to its chloro homologue 2, the addition of 1 equivalent of nBuEtMg to 1 affords a catalyst for a trans-selective polymerisation of isoprene.2

show abstract

Section: Introductionmentioning

confidence: 99%

Synthesis and X-ray structure of a borohydrido metallocene of neodymium and its use as pre-catalyst in Nd/Mg dual-component ethylene and isoprene polymerisations

Visseaux

Chenal

Roussel

et al. 2006

Journal of Organometallic Chemistry

View full text Add to dashboard Cite

show abstract

“…?-hydrogen Furthermore, bulkier alkanes do not react at all because these molecules cannot enter the narrow wedge between the canted (C5Me5) rings which is a requirement for the reaction to occur. Naturally hard Lewis bases bind strongly t o the lanthanide ion and a number of monomeric adducts (C5Me&LnMe(LB) with LB = THw 208.265.272,295,297,404,456.489.491 l7,:tnn~287.35S,456 Nl7,f,, 359. have been reported.…”

mentioning

confidence: 99%

Synthesis, Structure, and Reactivity of Organometallic .pi.-Complexes of the Rare Earths in the Oxidation State Ln3+ with Aromatic Ligands

Schumann¹,

Meese-Marktscheffel²,

Esser³

1995

Chem. Rev.

752

483

View full text Add to dashboard Cite

“…If chain transfer is negligible or very slow, the polymerization can be "living", as observed in group 5 metallocene-diene complexes [30,31]. b-Methyl elimination is also reported in bis(pentamethylcyclopentadienyl)metallocene catalysts [32,33].…”

Section: Termination Reactionsmentioning

confidence: 89%

Stereospecific Olefin Polymerization Catalyzed by Metallocene Complexes

Suzuki¹

2004

Topics in Organometallic Chemistry

View full text Add to dashboard Cite

.beta.-Alkyl transfer in a lanthanide model for chain termination

Cited by 223 publications

References 0 publications

Synthesis and X-ray structure of a borohydrido metallocene of neodymium and its use as pre-catalyst in Nd/Mg dual-component ethylene and isoprene polymerisations

Synthesis and X-ray structure of a borohydrido metallocene of neodymium and its use as pre-catalyst in Nd/Mg dual-component ethylene and isoprene polymerisations

Synthesis, Structure, and Reactivity of Organometallic .pi.-Complexes of the Rare Earths in the Oxidation State Ln3+ with Aromatic Ligands

Stereospecific Olefin Polymerization Catalyzed by Metallocene Complexes

Contact Info

Product

Resources

About