Noncoordinating Dendrimer Polyanions: Cocatalysts for the Metallocene-Catalyzed Olefin Polymerization

Mager, Michael; Becke, Sigurd; Windisch, Heike; Denninger, Uwe

doi:10.1002/1521-3773(20010518)40:10<1898::aid-anie1898>3.0.co;2-k

Cited by 44 publications

(20 citation statements)

References 59 publications

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“…For instance, Mager et al reported a series of weakly coordinating carbosilane dendrimers with organoborate functionalities at the periphery. 39 The negatively charged dendrimers were used as cocatalysts for metallocene-catalyzed olefin polymerization. Ethene, propene, as well as ethene/propene and ethene/1-hexene mixtures were successfully polymerized.…”

Section: Organoborate-containing Polymersmentioning

confidence: 99%

Boron-containing polymers as versatile building blocks for functional nanostructured materials

2011

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Section: Organoborate-containing Polymersmentioning

confidence: 99%

Boron-containing polymers as versatile building blocks for functional nanostructured materials

2011

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“…[54] The active form of the catalyst is cationic and is typically generated by a cocatalyst. [55] Co-catalysts G0 to G2 were synthesized with 4, 12, and 36 alkyl-tris-(pentafluorophenyl)borates at the periphery ( Figure 7). The interaction between the ion pair affects the overall activity, steroregularity, chain transfer, termination rate and lifetime of the metallocene catalyst.…”

Section: Peripherally Modified Dendrimers In Catalysismentioning

confidence: 99%

The Dendrimer Effect in Homogeneous Catalysis

2006

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The immobilization of catalytic groups onto a dendritic support either at the core or at the periphery gives rise to unique properties that affect rates of reaction, substrate activation or selectivity, etc. When advantageous, these properties can be classified as a positive dendrimer effect. Positive dendrimer effects can arise from site isolation, transition state stabilization and/or dielectric effects in the case of core-modified dendrimers, while peripherally modified dendrimers usually benefit from steric crowding or cooperativity for catalytic residues confined to the surface of the polymer. In this review, the appearance of positive dendrimer effects from the literature will be highlighted as well as prospects for future work in the field.

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“…35). 80 In a series of reports, Jakle and co-workers have reported a new route to organoboron polymers of PS that contained well-defined boron-containing Lewis acids. 81 These acidic polymers have the potential for use as cocatalysts in olefin polymerization and as catalysts in organic syntheses.…”

Section: Figure 31mentioning

confidence: 99%

The State of the Art in Boron Polymer Chemistry

Kolel-Veetil¹,

Keller²

2006

Macromolecules Containing Metal and Metal‐Like Elements

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I. INTRODUCTION A. A Brief Historical Perspective on Boron and Its PolymersBoron (Buraq in Arabic/Burah in Persian, which is the word for "white," the color being attributed to borax (sodium tetraborate, Na 2 B 4 O 7 .10H 2 O)) was discovered in 1808 independently by the British Chemist, Sir Humphry Davy, and two French chemists, Joseph Louis Gay-Lussac and Loius Jacques Thenard. 1 They isolated boron in 50% purity by the reduction of boric acid with sodium or magnesium. The Swedish chemist Jons Jakob Berzilius identified boron as an element in 1824. The first pure sample of boron was produced by the American chemist William Weintraub in 1909. Boron does not appear in nature in elemental form, but is found in its compounded

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Noncoordinating Dendrimer Polyanions: Cocatalysts for the Metallocene-Catalyzed Olefin Polymerization

Abstract: A new class of noncoordinating anions are the carbosilane dendrimers with perfluoroarylborate end groups (see picture). They activate and stabilize metallocenes to give catalytic systems that polymerize olefins, such as ethene, propene, and 1‐hexene, with high activity.

Cited by 44 publications

References 59 publications

Boron-containing polymers as versatile building blocks for functional nanostructured materials

Boron-containing polymers as versatile building blocks for functional nanostructured materials

The Dendrimer Effect in Homogeneous Catalysis

The State of the Art in Boron Polymer Chemistry

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