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Papers by George Britovsek

Research paper thumbnail of The Path Forward for Biofuels and Biomaterials

Science, 2006

Biomass represents an abundant carbon-neutral renewable resource for the production of bioenergy ... more Biomass represents an abundant carbon-neutral renewable resource for the production of bioenergy and biomaterials, and its enhanced use would address several societal needs. Advances in genetics, biotechnology, process chemistry, and engineering are leading to a new manufacturing concept for converting renewable biomass to valuable fuels and products, generally referred to as the biorefinery. The integration of agroenergy crops and biorefinery manufacturing technologies offers the potential for the development of sustainable biopower and biomaterials that will lead to a new manufacturing paradigm.

Research paper thumbnail of Heavy Metal Sensing Using Self-Assembled Nanoparticles at a Liquid-Liquid Interface

Advanced Optical Materials, 2014

Research paper thumbnail of Sensors: Heavy Metal Sensing Using Self-Assembled Nanoparticles at a Liquid-Liquid Interface (Advanced Optical Materials 10/2014)

Advanced Optical Materials, 2014

Research paper thumbnail of Dicarbonylrhodium(I) Complexes of Bipyridine Ligands with Proximate H-Bonding Substituents and Their Application in Methyl Acetate Carbonylation

European Journal of Inorganic Chemistry, 2011

Job/Unit: A11423 /KAP1 Date: 08-07-11 08:48:07 Pages: 13 ... Dicarbonylrhodium(I) Complexes of Bi... more Job/Unit: A11423 /KAP1 Date: 08-07-11 08:48:07 Pages: 13 ... Dicarbonylrhodium(I) Complexes of Bipyridine Ligands with Proximate H-Bonding Substituents and Their Application in Methyl Acetate Carbonylation ... Christopher M. Conifer,[a] David J. Law,[b] Glenn J. Sunley,[b] ...

Research paper thumbnail of Evaluation of mid-to-late transition metal imine catalysts for acetylene oligomerisation: A high activity bis(imino)pyridine iron(II) catalyst

Catalysis Today, Dec 1, 2011

Bis(imino)pyridine complexes of Co and Fe, and diimine complexes of Ni and Pd, have been tested a... more Bis(imino)pyridine complexes of Co and Fe, and diimine complexes of Ni and Pd, have been tested as catalysts for acetylene oligomerisation and polymerisation. While Co, Ni and Pd complexes displayed low activity, an Fe complex led to an extremely active system for acetylene polymerisation after activation with methylaluminoxane (MAO). The product output could be shifted towards short-chain oligomers by addition of the chain transfer reagent ZnEt 2 , leading to polyene oligomeric chains bound to Zn. Complex branched and cyclic higher oligomers were partially identified, and some possible mechanisms for their formation proposed. The Fe system did not successfully catalyse copolymerisation of acetylene and ethylene, although there was evidence of limited acetylene incorporation into ethylene oligomers.

Research paper thumbnail of Hemilabile ligands in palladium catalysed C_C linkages: the effect of the donor atom in the codimerisation of styrene with ethylene

J Mol Catal a Chem, 1996

Cationic η3-2-methylallylpalladium(II) complexes with potentially hemilabile ligands XCH2COOEt (X... more Cationic η3-2-methylallylpalladium(II) complexes with potentially hemilabile ligands XCH2COOEt (X = NPh2, PPh2, OPh, SPh) or methylpicolinate have been prepared and their catalytic properties in the codimerisation of styrene with ethylene have been investigated. The catalytic activity decreases in the order of decreasing trans influence of X: P ⪢ N ≈ O > S > pyr. The relationship between catalytic activity and spectroscopic properties of the complexes is discussed.

Research paper thumbnail of Improved synthesis of beta-lactams using a metal compound

Research paper thumbnail of Chain growth reaction process

Research paper thumbnail of 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, 2002

Research paper thumbnail of Cationic methylpalladium(II) complexes containing bidentate N–O ligands as catalysts for the copolymerisation of CO and ethylene. Identification and isolation of intermediates from the stepwise insertion reactions, and subsequent detailed mechanistic interpretation ‡

Journal of the Chemical Society, Dalton Transactions, 1998

Research paper thumbnail of C–H benzylic oxidation promoted by dinuclear iron DBDOC iminopyridine complexes

Inorganica Chimica Acta, 2015

ABSTRACT Several benzofurobenzofuran and methanodibenzodioxocine iminopyridine derivatives have b... more ABSTRACT Several benzofurobenzofuran and methanodibenzodioxocine iminopyridine derivatives have been used as ligands to form mononuclear and dinuclear iron complexes. Complexes 6, 7, 8, 9 and 10 were able to promote the catalytic oxidation of benzylic C-H bonds to ketones in moderate to high yields. The effects of backbone scaffold, nuclearity (mononuclear versus dinuclear) and nitrogen hybridization (iminopyridine versus aminopyridine) were studied. A strong effect on the yields of the nature and position of the substituents in the substrates was observed.

Research paper thumbnail of 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, 2002

Research paper thumbnail of ChemInform Abstract: The Search for New-Generation Olefin Polymerization Catalysts: Life beyond Metallocenes

Research paper thumbnail of Lewis and Broensted Multifunctionality: An Unusual Heterocycle from the Reaction of Bis(pentafluorophenyl)borinic Acid with Nitriles

ChemInform, 2006

ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Research paper thumbnail of A strong-field pentadentate ligand in iron-based alkane oxidation catalysis and implications for iron(iv) oxo intermediates

Catalysis Science & Technology, 2013

Research paper thumbnail of Unraveling the origins of catalyst degradation in non-heme iron-based alkane oxidation

Dalton Trans., 2014

A series of potentially tetradentate and pentadentate ligands modelled on BPMEN has been prepared... more A series of potentially tetradentate and pentadentate ligands modelled on BPMEN has been prepared and their iron(II) bis(triflate) complexes have been isolated and characterised by spectroscopic and crystallographic techniques (BPMEN = N,N'-bis(pyridylmethyl)ethylenediamine). Changes to the BPMEN ligand have invariably led to complexes with different coordination modes or geometries and with inferior catalytic efficiencies for the oxidation of cyclohexane with H2O2. The reaction of an iron(II) complex containing a pentadentate BPMEN-type ligand with O2 has resulted in ligand degradation via oxidative N-dealkylation and the isolation of a bis(hydroxo)-bridged dinuclear iron(III) complex with a picolinate-type ligand.

Research paper thumbnail of Hemilabile P,O-ligands in palladium catalysed C?C linkages: codimerization of ethylene and styrene and cooligomerization of ethylene and carbon monoxide

Journal of the Chemical Society, Chemical Communications, 1993

Research paper thumbnail of Bis(imino)pyridyl iron and cobalt complexes: the effect of nitrogen substituents on ethylene oligomerisation and polymerisation

Journal of the Chemical Society, Dalton Transactions, 2001

The synthesis and characterisation of 2,6-bis(imino)pyridyl iron and cobalt complexes [(2,6-(RN C... more The synthesis and characterisation of 2,6-bis(imino)pyridyl iron and cobalt complexes [(2,6-(RN CMe) 2 C 5 H 3 N)MCl 2 ] containing nitrogen substituents of the type R = NPh 2 , NPhMe, NMe 2 or 2,5-dimethylpyrrolyl are described. These complexes, in combination with the co-...

Research paper thumbnail of Oxygen Insertion into Metal Carbon Bonds: Formation of Methylperoxo Pd(II) and Pt(II) Complexes via Photogenerated Dinuclear Intermediates

Journal of the American Chemical Society, 2014

Platinum(II) and palladium(II) complexes [M(CH3)(L)]SbF6 with substituted terpyridine ligands L u... more Platinum(II) and palladium(II) complexes [M(CH3)(L)]SbF6 with substituted terpyridine ligands L undergo light-driven oxygen insertion reactions into metal methyl bonds resulting in methylperoxo complexes [M(OOCH3)(L)]SbF6. The oxygen insertion reactions occur readily for complexes with methyl ligands that are activated due to steric interaction with substituents (NH2, NHMe or CH3) at the 6,6″-positions on the terpyridine ligand. All complexes exhibit attractive intermolecular π···π or M···M interactions in the solid state and in solution, which lead to excited triplet dinuclear M-M complexes upon irradiation. A mechanism is proposed whereby a dinuclear intermediate is generated upon irradiation that has a weakened M-C bond in the excited state, resulting in the observed oxygen insertion reactions.

Research paper thumbnail of Synthesis and reactivity of water-soluble platinum (II) complexes containing nitrogen ligands

Journal of Organometallic Chemistry, 2003

A series of water-soluble platinum(II) complexes containing bidentate imino pyridine ligands L of... more A series of water-soluble platinum(II) complexes containing bidentate imino pyridine ligands L of the general formula LPtX2 (X=Cl or Me) have been prepared. The dichloro complexes are very stable in water or dimethyl sulfoxide (DMSO), even at elevated temperatures, whereas the dimethyl complexes are less stable in these strongly polar solvents. In DMSO, an equilibrium between the complex LPtMe2 and

Research paper thumbnail of The Path Forward for Biofuels and Biomaterials

Science, 2006

Biomass represents an abundant carbon-neutral renewable resource for the production of bioenergy ... more Biomass represents an abundant carbon-neutral renewable resource for the production of bioenergy and biomaterials, and its enhanced use would address several societal needs. Advances in genetics, biotechnology, process chemistry, and engineering are leading to a new manufacturing concept for converting renewable biomass to valuable fuels and products, generally referred to as the biorefinery. The integration of agroenergy crops and biorefinery manufacturing technologies offers the potential for the development of sustainable biopower and biomaterials that will lead to a new manufacturing paradigm.

Research paper thumbnail of Heavy Metal Sensing Using Self-Assembled Nanoparticles at a Liquid-Liquid Interface

Advanced Optical Materials, 2014

Research paper thumbnail of Sensors: Heavy Metal Sensing Using Self-Assembled Nanoparticles at a Liquid-Liquid Interface (Advanced Optical Materials 10/2014)

Advanced Optical Materials, 2014

Research paper thumbnail of Dicarbonylrhodium(I) Complexes of Bipyridine Ligands with Proximate H-Bonding Substituents and Their Application in Methyl Acetate Carbonylation

European Journal of Inorganic Chemistry, 2011

Job/Unit: A11423 /KAP1 Date: 08-07-11 08:48:07 Pages: 13 ... Dicarbonylrhodium(I) Complexes of Bi... more Job/Unit: A11423 /KAP1 Date: 08-07-11 08:48:07 Pages: 13 ... Dicarbonylrhodium(I) Complexes of Bipyridine Ligands with Proximate H-Bonding Substituents and Their Application in Methyl Acetate Carbonylation ... Christopher M. Conifer,[a] David J. Law,[b] Glenn J. Sunley,[b] ...

Research paper thumbnail of Evaluation of mid-to-late transition metal imine catalysts for acetylene oligomerisation: A high activity bis(imino)pyridine iron(II) catalyst

Catalysis Today, Dec 1, 2011

Bis(imino)pyridine complexes of Co and Fe, and diimine complexes of Ni and Pd, have been tested a... more Bis(imino)pyridine complexes of Co and Fe, and diimine complexes of Ni and Pd, have been tested as catalysts for acetylene oligomerisation and polymerisation. While Co, Ni and Pd complexes displayed low activity, an Fe complex led to an extremely active system for acetylene polymerisation after activation with methylaluminoxane (MAO). The product output could be shifted towards short-chain oligomers by addition of the chain transfer reagent ZnEt 2 , leading to polyene oligomeric chains bound to Zn. Complex branched and cyclic higher oligomers were partially identified, and some possible mechanisms for their formation proposed. The Fe system did not successfully catalyse copolymerisation of acetylene and ethylene, although there was evidence of limited acetylene incorporation into ethylene oligomers.

Research paper thumbnail of Hemilabile ligands in palladium catalysed C_C linkages: the effect of the donor atom in the codimerisation of styrene with ethylene

J Mol Catal a Chem, 1996

Cationic η3-2-methylallylpalladium(II) complexes with potentially hemilabile ligands XCH2COOEt (X... more Cationic η3-2-methylallylpalladium(II) complexes with potentially hemilabile ligands XCH2COOEt (X = NPh2, PPh2, OPh, SPh) or methylpicolinate have been prepared and their catalytic properties in the codimerisation of styrene with ethylene have been investigated. The catalytic activity decreases in the order of decreasing trans influence of X: P ⪢ N ≈ O > S > pyr. The relationship between catalytic activity and spectroscopic properties of the complexes is discussed.

Research paper thumbnail of Improved synthesis of beta-lactams using a metal compound

Research paper thumbnail of Chain growth reaction process

Research paper thumbnail of 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, 2002

Research paper thumbnail of Cationic methylpalladium(II) complexes containing bidentate N–O ligands as catalysts for the copolymerisation of CO and ethylene. Identification and isolation of intermediates from the stepwise insertion reactions, and subsequent detailed mechanistic interpretation ‡

Journal of the Chemical Society, Dalton Transactions, 1998

Research paper thumbnail of C–H benzylic oxidation promoted by dinuclear iron DBDOC iminopyridine complexes

Inorganica Chimica Acta, 2015

ABSTRACT Several benzofurobenzofuran and methanodibenzodioxocine iminopyridine derivatives have b... more ABSTRACT Several benzofurobenzofuran and methanodibenzodioxocine iminopyridine derivatives have been used as ligands to form mononuclear and dinuclear iron complexes. Complexes 6, 7, 8, 9 and 10 were able to promote the catalytic oxidation of benzylic C-H bonds to ketones in moderate to high yields. The effects of backbone scaffold, nuclearity (mononuclear versus dinuclear) and nitrogen hybridization (iminopyridine versus aminopyridine) were studied. A strong effect on the yields of the nature and position of the substituents in the substrates was observed.

Research paper thumbnail of 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, 2002

Research paper thumbnail of ChemInform Abstract: The Search for New-Generation Olefin Polymerization Catalysts: Life beyond Metallocenes

Research paper thumbnail of Lewis and Broensted Multifunctionality: An Unusual Heterocycle from the Reaction of Bis(pentafluorophenyl)borinic Acid with Nitriles

ChemInform, 2006

ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance t... more ABSTRACT ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

Research paper thumbnail of A strong-field pentadentate ligand in iron-based alkane oxidation catalysis and implications for iron(iv) oxo intermediates

Catalysis Science & Technology, 2013

Research paper thumbnail of Unraveling the origins of catalyst degradation in non-heme iron-based alkane oxidation

Dalton Trans., 2014

A series of potentially tetradentate and pentadentate ligands modelled on BPMEN has been prepared... more A series of potentially tetradentate and pentadentate ligands modelled on BPMEN has been prepared and their iron(II) bis(triflate) complexes have been isolated and characterised by spectroscopic and crystallographic techniques (BPMEN = N,N'-bis(pyridylmethyl)ethylenediamine). Changes to the BPMEN ligand have invariably led to complexes with different coordination modes or geometries and with inferior catalytic efficiencies for the oxidation of cyclohexane with H2O2. The reaction of an iron(II) complex containing a pentadentate BPMEN-type ligand with O2 has resulted in ligand degradation via oxidative N-dealkylation and the isolation of a bis(hydroxo)-bridged dinuclear iron(III) complex with a picolinate-type ligand.

Research paper thumbnail of Hemilabile P,O-ligands in palladium catalysed C?C linkages: codimerization of ethylene and styrene and cooligomerization of ethylene and carbon monoxide

Journal of the Chemical Society, Chemical Communications, 1993

Research paper thumbnail of Bis(imino)pyridyl iron and cobalt complexes: the effect of nitrogen substituents on ethylene oligomerisation and polymerisation

Journal of the Chemical Society, Dalton Transactions, 2001

The synthesis and characterisation of 2,6-bis(imino)pyridyl iron and cobalt complexes [(2,6-(RN C... more The synthesis and characterisation of 2,6-bis(imino)pyridyl iron and cobalt complexes [(2,6-(RN CMe) 2 C 5 H 3 N)MCl 2 ] containing nitrogen substituents of the type R = NPh 2 , NPhMe, NMe 2 or 2,5-dimethylpyrrolyl are described. These complexes, in combination with the co-...

Research paper thumbnail of Oxygen Insertion into Metal Carbon Bonds: Formation of Methylperoxo Pd(II) and Pt(II) Complexes via Photogenerated Dinuclear Intermediates

Journal of the American Chemical Society, 2014

Platinum(II) and palladium(II) complexes [M(CH3)(L)]SbF6 with substituted terpyridine ligands L u... more Platinum(II) and palladium(II) complexes [M(CH3)(L)]SbF6 with substituted terpyridine ligands L undergo light-driven oxygen insertion reactions into metal methyl bonds resulting in methylperoxo complexes [M(OOCH3)(L)]SbF6. The oxygen insertion reactions occur readily for complexes with methyl ligands that are activated due to steric interaction with substituents (NH2, NHMe or CH3) at the 6,6″-positions on the terpyridine ligand. All complexes exhibit attractive intermolecular π···π or M···M interactions in the solid state and in solution, which lead to excited triplet dinuclear M-M complexes upon irradiation. A mechanism is proposed whereby a dinuclear intermediate is generated upon irradiation that has a weakened M-C bond in the excited state, resulting in the observed oxygen insertion reactions.

Research paper thumbnail of Synthesis and reactivity of water-soluble platinum (II) complexes containing nitrogen ligands

Journal of Organometallic Chemistry, 2003

A series of water-soluble platinum(II) complexes containing bidentate imino pyridine ligands L of... more A series of water-soluble platinum(II) complexes containing bidentate imino pyridine ligands L of the general formula LPtX2 (X=Cl or Me) have been prepared. The dichloro complexes are very stable in water or dimethyl sulfoxide (DMSO), even at elevated temperatures, whereas the dimethyl complexes are less stable in these strongly polar solvents. In DMSO, an equilibrium between the complex LPtMe2 and