Isospecific Living Polymerization of 1-Hexene by a Readily Available Nonmetallocene C2-Symmetrical Zirconium Catalyst  [J. Am. Chem. Soc. 2000, 122, 10706−10707].

Tshuva, Edit Y.; Goldberg, and Israel; Kol, Moshe

doi:10.1021/ja0151450

Cited by 25 publications

(25 citation statements)

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“…5), originally introduced by Kol and coworkers (20). We had been attracted by this ligand framework because it closely mimics the coordination environment of the surface Ti atoms in the classical heterogeneous Ziegler-Natta systems for the industrial production of isotactic polypropylene (1,4,6).…”

Section: Resultsmentioning

confidence: 99%

“…When we started our work, two (ONNO)ZrBn 2 complexes, with R 1 (ϭ R 2 ) ϭ methyl (1) and tert-butyl (3), had been reported and upon activation with B(C 6 F 5 ) 3 found to mediate the polymerization of 1-hexene, the latter in isotactic and living fashion (20). These systems appeared ideal entries for a validation of our modeling; therefore, we prepared and tested them in propene polymerization.…”

Section: Resultsmentioning

confidence: 99%

“…Air-sensitive compounds were manipulated under argon, using Schlenk techniques and͞or a Braun (Melsungen, Germany) LabMaster 130 glove box. Complexes 1 and 3-5 were prepared as described (19,20). Complexes 2, 6, and 7 were synthesized with similar procedures, as described in Supporting Text.…”

Section: Methodsmentioning

confidence: 99%

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Design of stereoselective Ziegler–Natta propene polymerization catalysts

Busico

Cipullo

Pellecchia

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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After five decades of largely serendipitous (albeit formidable) progress, catalyst design in Ziegler-Natta olefin polymerization, i.e., the rational implementation of new active species to target predetermined polyolefin architectures, has ultimately become a realistic ambition, thanks to a much deeper fundamental understanding and major advances in the tools of computational chemistry. In this article, we discuss, as a case history, a unique class of stereorigid C 2-symmetric bis(phenoxy-amine)Zr(IV) catalysts with controlled kinetic behavior. A large variety of polypropylene microstructures have been obtained with these catalysts by modulating the steric demand of one key substituent, without altering the nature and symmetry of the ancillary ligand framework, under the guidance of computer modeling. This unusual achievement is relevant per se and for the perspective implications in catalyst discovery.enantioselectivity ͉ olefin polymerization ͉ polypropylene

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Design of stereoselective Ziegler–Natta propene polymerization catalysts

Busico

Cipullo

Pellecchia

et al. 2006

Proc. Natl. Acad. Sci. U.S.A.

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“…This postulation is supported by literature in which ligands similar to 9 and 16 report N−Zr−N bond angles of 103.3° and 70.2° respectively. 19,11 This dramatic difference in bonding geometry may well account for our observations. To circumvent this issue, we proceeded to investigate ligand 16, which left the coordination modes unchanged.…”

mentioning

confidence: 51%

“…Using conditions similar to Kol and co-workers for the metallation of Zr and Hf, two novel complexes were synthesized (Scheme 3). 11 Currently, precatalysts 17 and 18 are being evaluated for redox behavior and polymerization activity. …”

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confidence: 99%

STIR: Redox-Switchable Olefin Polymerization Catalysis: Electronically Tunable Ligands for Controlled Polymer Synthesis

Long¹

2013

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Olefin polymerization catalysts containing redox-active moieties that may be tuned in situ via electrochemical or chemical oxidation and reduction were synthesized and examined. The redox capable functionalities were incorporated into specifically chosen ligand frameworks and metallated using organometallic reagents so as to produce precatalysts that could be activated using methylaluminoxane, borane, or boronate-based activators. Those catalysts were shown to be active toward olefin polymerizations,their electrochemistry studied, and their in situ ABSTRACTOlefin polymerization catalysts containing redox-active moieties that may be tuned in situ via electrochemical or chemical oxidation and reduction were synthesized and examined. The redox capable functionalities were incorporated into specifically chosen ligand frameworks and metallated using organometallic reagents so as to produce precatalysts that could be activated using methylaluminoxane, borane, or boronate-based activators. Those catalysts were shown to be active toward olefin polymerizations,their electrochemistry studied, and their in situ switchability is currently underway yielding many promising results. (c) Presentations

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Diamine bis(phenolate) and pendant amine bis(phenolate) ligands: catalytic activity for the room temperature palladium‐catalyzed Suzuki–Miyauracoupling reaction

Bowser

Anderson-Wile

Johnston

et al. 2015

Applied Organom Chemis

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A series of amine bis(phenolate) ligands bearing aryl substituents of varying steric bulk are reported and characterized using single‐crystal X‐ray diffraction, NMR spectroscopy and high‐resolution mass spectrometry experiments. Palladium complexes derived in situ from these ligands are evaluated as catalysts for the Suzuki–Miyaura coupling of phenylboronic acid and aryl bromides. High conversions are observed for these reactions in methanol solvent at low catalyst loadings (0.01 mol%), short reaction times (30 min) and mild temperatures (30°C). Conversion is observed for a range of substrates, and is found to depend on the nature of the external base and solvent employed. These findings demonstrate the utility of catalysts derived from late transition metal complexes of amine bis(phenolate) ligands, particularly those bearing bulky cumyl substituents. Copyright © 2015 John Wiley & Sons, Ltd.

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Isospecific Living Polymerization of 1-Hexene by a Readily Available Nonmetallocene C₂-Symmetrical Zirconium Catalyst [J. Am. Chem. Soc. 2000, 122, 10706−10707].

Cited by 25 publications

References 0 publications

Design of stereoselective Ziegler–Natta propene polymerization catalysts

Design of stereoselective Ziegler–Natta propene polymerization catalysts

STIR: Redox-Switchable Olefin Polymerization Catalysis: Electronically Tunable Ligands for Controlled Polymer Synthesis

Diamine bis(phenolate) and pendant amine bis(phenolate) ligands: catalytic activity for the room temperature palladium‐catalyzed Suzuki–Miyauracoupling reaction

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