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Journal articleBritovsek GJP, Cohen SA, Gibson VC, et al., 2004,
Iron catalyzed polyethylene chain growth on zinc: a study of the factors delineating chain transfer versus catalyzed chain growth in zinc and related metal alkyl systems
, Journal of the American Chemical Society, Vol: 126, Pages: 10701-10712, ISSN: 0002-7863 -
Journal articleBritovsek GJP, Woo GYY, Assavathorn N, 2003,
Synthesis and reactivity of water-soluble platinum(II) complexes containing nitrogen ligands
, JOURNAL OF ORGANOMETALLIC CHEMISTRY, Vol: 679, Pages: 110-115, ISSN: 0022-328X- Author Web Link
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- Citations: 15
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Journal articleBritovsek GJP, Gibson VC, Hoarau OD, et al., 2003,
Iron and cobalt ethylene polymerization catalysts: Variations on the central donor
, INORGANIC CHEMISTRY, Vol: 42, Pages: 3454-3465, ISSN: 0020-1669- Author Web Link
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- Citations: 169
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Journal articleBritovsek GJP, Baugh SPD, Hoarau O, et al., 2003,
The role of bulky substituents in the polymerization of ethylene using late transition metal catalysts: a comparative study of nickel and iron catalyst systems
, INORGANICA CHIMICA ACTA, Vol: 345, Pages: 279-291, ISSN: 0020-1693- Author Web Link
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- Citations: 142
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PatentBritovsek GJP, Cohen SA, Gibson VC, 2003,
Chain growth reaction process
, WO03014046 -
PatentBritovsek GJP, Cohen SA, Gibson VC, 2002,
Chain growth reaction process using zinc alkyls for preparation of olefin oligomers
, 2003014046 -
Journal articleBritovsek GJP, Clentsmith GKB, Gibson VC, et al., 2002,
The nature of the active site in bis(imino)pyridine iron ethylene polymerisation catalysts
, CATALYSIS COMMUNICATIONS, Vol: 3, Pages: 207-211, ISSN: 1566-7367- Author Web Link
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- Citations: 109
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Journal articleBritovsek GJP, Cohen SA, Gibson VC, et al., 2002,
Iron-catalyzed polyethylene chain growth on zinc: Linear α-olefins with a poisson distribution
, Angewandte Chemie - International Edition, Vol: 41, Pages: 489-491, ISSN: 1433-7851Bis(imino)pyridineiron complexes are not only highly active for ethylene polymerization, they are shown to catalyze efficient polyethylene chain growth at zinc centers - formally an iron-catalyzed Aufbaureaktion on zinc (see scheme). The grown alkyl chains can be displaced from the zinc centers by an olefin exchange reaction catalyzed, for example, [Ni(acac)2] (acac = acetylacetonate) to give linear α-olefins with a Poisson distribution.
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Journal articleBritovsek GJP, Cohen SA, Gibson VC, et al., 2002,
Iron-catalyzed polyethylene chain growth on zinc:: Linear α-olefins with a Poisson distribution
, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 41, Pages: 489-491, ISSN: 1433-7851- Author Web Link
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- Citations: 177
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Journal articleBritovsek GJP, Gibson VC, Spitzmesser SK, et al., 2002,
Cationic 2,6-bis(imino)pyridine iron and cobalt complexes: synthesis, structures, ethylene polymerisation and ethylene/polar monomer co-polymerisation studies
, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, Pages: 1159-1171, ISSN: 1472-7773- Author Web Link
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- Citations: 151
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Journal articleBritovsek GJP, Clentsmith GKB, Gibson VC, et al., 2001,
Spectroscopic studies on iron-based ethylene polymerization catalysts.
, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 222, Pages: U415-U415, ISSN: 0065-7727 -
Journal articleBritovsek GJP, Gibson VC, Mastroianni S, et al., 2001,
Imine versus amine donors in iron-based ethylene polymerisation catalysts
, EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Pages: 431-437, ISSN: 1434-1948- Author Web Link
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- Citations: 101
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Journal articleMagill AM, McGuinness DS, Cavell KJ, et al., 2001,
Palladium(II) complexes containing mono-, bi- and tridentate carbene ligands. Synthesis, characterisation and application as catalysts in C-C coupling reactions
, JOURNAL OF ORGANOMETALLIC CHEMISTRY, Vol: 617, Pages: 546-560, ISSN: 0022-328X- Author Web Link
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- Citations: 336
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Conference paperBritovsek GJP, Clentsmith GKB, Gibson VC, et al., 2001,
Spectroscopic studies on iron-based ethylene polymerization catalysts (Meeting abstract CATL-040)
, Washington, D.C., Abstracts of papers, 222nd ACS national meeting, Chicago, IL, United States, 26 - 30 August 2001, Publisher: American Chemical Society -
Journal articleBritovsek GJP, Gibson VC, Kimberley BS, et al., 2001,
Bis(imino)pyridyl iron and cobalt complexes: the effect of nitrogen substituents on ethylene oligomerisation and polymerisation
, JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS, Pages: 1639-1644, ISSN: 1472-7773- Author Web Link
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- Citations: 119
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Journal articleBritovsek GJP, Bruce M, Gibson VC, et al., 2000,
Iron and cobalt ethylene polymerization catalysts bearing 2,6-bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies
, Chemtracts, Vol: 13, Pages: 303-308, ISSN: 1431-9268Chelating 2,6-bis(imino)pyridyl ligands, readily prepared via condensation reactions, coordinate to Fe(II), and Fe(III), and Co(II) halide salts to give monomeric, paramagnetic complexes. Activation of these compounds with methylaluminoxane results in highly reactive catalytic species for the production of linear polyethylene. Iron-based catalysts were found to be more active than cobalt-based systems, and ketimine ligands generally imparted enhanced efficiency compared to the analogous aldimine ligands. Bulky substituents at the ortho positions of the aryl groups were found to be crucial for optimal catalytic activity. Investigations of the various reaction conditions, including amount of MAO, ethylene pressure, reaction time and temperature, revealed that chain termination likely proceeds via two competing mechanisms, namely β-H transfer and chain transfer to aluminum.
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Journal articleGibson VC, Britovsek GJP, 2000,
Advances in iron and cobalt ethylene polymerization systems.
, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 219, Pages: U389-U389, ISSN: 0065-7727 -
Journal articleGibson VC, Britovsek GJP, Spitzmesser SK, 2000,
Cationic iron and cobalt complexes containing bis(imino)pyridyl ligands.
, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 219, Pages: U426-U426, ISSN: 0065-7727 -
Journal articleGibson VC, Britovsek GJP, Spitzmesser SK, 2000,
Cationic iron and cobalt complexes containing bis(imino)pyridyl ligands
, Polymer Preprints, Vol: 41 -
PatentBritovsek GJP, Gibson VC, Spitzmesser SK, 2000,
Cationic Polymerisation Catalysts
, WO 00/69869 -
Journal articleGibson VC, Britovsek GJP, Spitzmesser SK, 2000,
Cationic iron and cobalt complexes containing bis(imino)pyridyl ligands
, Polymer Preprints, Vol: 41 -
Journal articleGibson VC, Britovsek GJP, 2000,
Advances in iron and cobalt ethylene polymerization systems
, Abstracts of Papers of the American Chemical Society, Vol: 219, Pages: 229-OLY, ISSN: 0065-7727 -
Journal articleBritovsek GJP, Mastroianni S, Solan GA, et al., 2000,
Oligomerisation of ethylene by bis(imino)pyridyl iron and -cobalt complexes
, Chemistry-A European Journal, Vol: 6, Pages: 2221-2231, ISSN: 0947-6539 -
Journal articleGriffiths EAH, Britovsek GJP, Gibson VC, et al., 1999,
Full ab initio calculations on bis(imino)pyridine iron catalysts for ethylene polymerization.
, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 218, Pages: U762-U762, ISSN: 0065-7727 -
Journal articleGibson VC, Mastroianni S, McTavish SJ, et al., 1999,
Influence of ligand substituents on polyethylenes generated by bis(imino)pyridyl iron catalysts.
, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 218, Pages: U762-U762, ISSN: 0065-7727 -
Journal articleBritovsek GJP, Gibson VC, Wass DF, 1999,
The search for new-generation olefin polymerization catalysts: Life beyond metallocenes
, Angewandte Chemie - International Edition, Vol: 38, Pages: 428-447, ISSN: 1433-7851The introduction of well-defined, single-site organotransition metal olefin polymerization catalysts in the early 1980s highlighted the possibilities for controlling and dramatically improving the properties of commodity polymer products such as polyethylene and polypropylene. Group 4 metallocenes and half-sandwich titanium-amide complexes (constrained-geometry catalysts) have been at the forefront of these developments, and, as we approach the late 1990s, these catalysts are increasingly finding their way into commercial operations. However, it is generally acknowledged that no single class of catalyst will be capable of controlling all of the macromolecular parameters relevant to a wide and varied range of polyolefinic products. Over the past few years, an intense search has therefore developed, in both academic and industrial research laboratories, for new-generation catalysts. Some of the most significant recent developments have occurred with late transition metal systems. Particularly, the discovery of exceptionally active catalysts based on iron, a metal that had no previous track record of being applied in this way, has signposted the way for further technologically significant advances in the field. In this review, we highlight the key advances that have occurred in the discovery and development of non-Group 4 metallocene catalysts, amply demonstrating that there are significant signs of life beyond the Group 4 metallocenes. © Wiley-VCH Verlag GmbH, 1999.
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Journal articleBritovsek GJP, Bruce M, Gibson VC, et al., 1999,
Iron and cobalt ethylene polymerization catalysts bearing 2,6- bis(imino)pyridyl ligands: Synthesis, structures, and polymerization studies
, Journal of the American Chemical Society, Vol: 121, Pages: 8728-8740, ISSN: 0002-7863 -
Journal articleGriffiths EAH, Britovsek GJP, Gibson VC, et al., 1999,
Highly active ethylene polymerisation catalysts based on iron: an ab initio study
, Chemical Communications, Pages: 1333-1334, ISSN: 1359-7345 -
Journal articleGriffiths EAH, Britovsek GJP, Gibson VC, et al., 1999,
Highly active ethylene polymerisation catalysts based on iron: an ab initio study
, Chemical Communications, Pages: 1333-1334, ISSN: 1359-7345 -
Journal articleBritovsek GJP, Gibson VC, Wass DF, 1999,
The search for new-generation olefin polymerization catalysts: Life beyond metallocenes
, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 38, Pages: 428-447, ISSN: 1433-7851- Author Web Link
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- Citations: 2093
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Contact
Prof. Dr. George Britovsek FRSC
Director MRes Catalysis & Engineering
Tel: +44 (0)20 7594 5863
Email: g.britovsek@imperial.ac.uk
Department of Chemistry
Imperial College London
Molecular Sciences Research Hub
White City Campus
80 Wood Lane
London W12 0BZ
United Kingdom