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Gabor Laurenczy

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Related publications (98)

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Mechanistic Studies on the Formation of eta(2)-Diphosphine (eta(6)-p-cymene)ruthenium(II) Compounds

Paul Joseph Dyson, Gabor Laurenczy, Céline Fellay

A new range of pendent diphosphine (η6-p-cymene)ruthenium(II) complexes, [RuCl(PPh3)(η1-(P-P))(η6-p-cymene)]PF6 (P-P = dppm, cis-PPh2CHCHPPh2

2007

CO2 as hydrogen vector - Transition metal diamine catalysts for selective HCOOH dehydrogenation

Gabor Laurenczy, Cornel Fink

The homogeneous catalytic dehydrogenation of formic acid in aqueous solution provides an efficient in situ method for hydrogen production, under mild conditions, and at an adjustable rate. We synthesized a series of catalysts with the chemical formula [Cp* ...

2017

A Well-Defined Iron Catalyst for the Reduction of Bicarbonates and Carbon Dioxide to Formates, Alkyl Formates, and Formamides

Paul Joseph Dyson, Rosario Scopelliti, Gabor Laurenczy

Wiley-VCH Verlag GmbH2010

Experimental and theoretical study of intramolecular exchange in Ir2Rh2(CO)(12) and Ir-4(CO)(11)(mu-SO2)

Ursula Röthlisberger, Gabor Laurenczy, Raymond Roulet, Leonardo Guidoni, Zoltan Beni

As observed by variable-temperature and -pressure C-13 NMR, intramolecular carbonyl scrambling in Ir2Rh2(CO)(12) and Ir-4(CO)(11)(mu-SO2) proceeds via a 'change of basal face' mechanism. In both cases the site exchange process has a positive activation vol ...

2005

Influence of water-soluble sulfonated phosphine ligands on ruthenium catalyzed generation of hydrogen from formic acid

Paul Joseph Dyson, Gabor Laurenczy, Céline Fellay, Weijia Gan

Hydrogen can be generated from formic acid in aq. phase homogeneous catalytic reactions using ruthenium catalysts with water-sol. phosphine ligands. A comparison of tri-, di-, and mono-sulfonato triphenylphosphine, disulfonato diphenyl-alkyl-phosphines (Ph ...

Taylor & Francis2010

Mechanistic Study of the N-Formylation of Amines with Carbon Dioxide and Hydrosilanes

Paul Joseph Dyson, Gabor Laurenczy, Martin Hulla

N-formylation of amines with CO2 and hydrosilane reducing agents proceeds via fast and complex chemical equilibria, which hinder easy analysis of the reaction pathways. In situ reaction monitoring and kinetic studies reveal that three proposed pathways, vi ...

2018

Allyl-functionalised ionic liquids: Synthesis, characterisation, and reactivity

Paul Joseph Dyson, Rosario Scopelliti, Gabor Laurenczy, Zhaofu Fei, Dongbin Zhao

The two known Me- and allyl-substituted 1H-imidazol-3-ium bromides 1 and 2, respectively, were converted to the corresponding BF4- and BPh4- salts 3-6 (Scheme 1). Compounds 3 and 4 were liquids at ambient temperature. Reaction of 1 or 2 with [PdCl2] afford ...

2005

An efficient Pt nanoparticle–ionic liquid system for the hydrodeoxygenation of bio-derived phenols under mild conditions

Paul Joseph Dyson, Gabor Laurenczy, Zhaofu Fei, Lu Chen, Cornel Fink

Platinum nanoparticles (NPs) were synthesized in situ in the ionic liquid (IL) [Emim]NTf2 (1-ethyl-3- methylimidazolium bis(trifluoromethylsulfonyl)imide) as well as in mixtures of [Emim]NTf2 with a second IL, Lewis acid or Brønsted acid, but in the absenc ...

Royal Society of Chemistry2017

Direct synthesis of formic acid from carbon dioxide by hydrogenation in acidic media

Paul Joseph Dyson, Gabor Laurenczy, Séverine Joëlle Moret

The chemical transformation of carbon dioxide into useful products becomes increasingly important as CO2 levels in the atmosphere continue to rise as a consequence of human activities. In this article we describe the direct hydrogenation of CO2 into formic ...

Nature Research2014

Recent progress for reversible homogeneous catalytic hydrogen storage in formic acid and in methanol

Gabor Laurenczy

Development of technologies using hydrogen as an energy carrier instead of fossil fuels is strongly required today. Especially, new, reversible, sustainable hydrogen storage technologies have received increasing attention. Formic acid (FA) and methanol (CH ...

Elsevier2018

Electrostatic and Non-covalent Interactions in Dicationic Imidazolium-Sulfonium Salts with Mixed Anions

Paul Joseph Dyson, Rosario Scopelliti, Gabor Laurenczy, Zhaofu Fei, Ning Yan

A series of thioether-functionalised imidazolium salts have been prepared and characterized. Subsequent reaction of the thioether-functionalised imidazolium salts with iodomethane affords imidazolium-sulfonium salts composed of doubly charged cations and t ...

Wiley-V C H Verlag Gmbh2014

Delineating the Mechanism of Ionic Liquids in the Synthesis of Quinazoline-2,4(1H,3H)-dione from 2-Aminobenzonitrile and CO2

Paul Joseph Dyson, Gabor Laurenczy, Shoubhik Das, Martin Hulla

Ionic liquids (ILs) are versatile solvents and catalysts for the synthesis of quinazoline-2,4-dione from 2-aminobenzonitrile and CO2. However, the role of the IL in this reaction is poorly understood. Consequently, we investigated this reaction and showed ...

Wiley-Blackwell2017

Direct carbon dioxide hydrogenation to formic acid in acidic media

Paul Joseph Dyson, Gabor Laurenczy, Séverine Joëlle Moret

The present invention relates to a method of producing formic acid in a catalysed chemical reaction from hydrogen gas and carbon dioxide gas, said reaction being conducted in an acidic medium comprising a polar solvent over a wide range of temperatures at ...

2016

Regioselectivity in aqueous palladium catalysed hydroxycarbonylation of styrene: a catalytic and mechanistic study

Gabor Laurenczy, Anisoara Ionescu

Regioselectivity control was studied in palladium catalyzed hydroxycarbonylation of styrene in neat water with water-sol. phosphines, mostly trisulfonated triphenylphosphine, TPPTS, but also N-bis(N',N'-diethyl-2-aminoethyl)-4-aminomethylphenyl-diphenylpho ...

2006

Synthesis of Gold Nanoparticle Catalysts Based on a New Water-Soluble Ionic Polymer

Paul Joseph Dyson, Gabor Laurenczy, Ilaria Biondi

A new water-soluble methyl-imidazolium-based ionic polymer was synthesized by ring-opening metathesis polymerization that was subsequently used to prepare aqueous gold nanoparticle solutions which were characterized by UVvis spectroscopy and transmission e ...

2011

Biphasic Hydrosilylation in Ionic Liquids: A Process Set for Industrial Implementation

Paul Joseph Dyson, Gabor Laurenczy, Dongbin Zhao

The biphasic hydrosilylation of 1-hexadecene with siloxane B9800 in a range of ionic liqs. is reported. Of the ionic liqs. tested, [C4py][BF4] and [C4-3-pic][BF4] offer the optimum compromise between activity and ...

2006

Lignin First: Confirming the Role of the Metal Catalyst in Reductive Fractionation

Paul Joseph Dyson, Gabor Laurenczy, Zhaofu Fei, Ning Yan, Antoine Philippe Van Muyden, Lu Chen, Xinjiang Cui

Rhodium nanoparticles embedded on the interior of hollow porous carbon nanospheres, able to sieve monomers from polymers, were used to confirm the precise role of metal catalysts in the reductive catalytic fractionation of lignin. The study provides clear ...

AMER CHEMICAL SOC2021

Towards the development of a hydrogen battery

Gabor Laurenczy

A novel Ru-catalyzed hydrogenation of carbon dioxide proceeds with an unprecedented high formic acid to amine ratio (AAR of 2.69), which results in an improved energy content. The presented catalyst system allows for reversible fast hydrogen loading (even ...

Royal Soc Chemistry2012

A simple catalyst for aqueous phase Suzuki reactions based on palladium nanoparticles immobilized on an ionic polymer

Paul Joseph Dyson, Gabor Laurenczy, Zhaofu Fei, Emilia Paunescu

Palladium nanoparticles immobilized on a cross-linked imidazolium-containing polymer were evaluated as a catalyst for Suzuki carbon-carbon cross-coupling reactions using water as the solvent. The nanocatalysts show good catalytic activities for aryl iodide ...

Science Press2016

Hydrogen Storage in the Carbon Dioxide - Formic Acid Cycle

Gabor Laurenczy, Cornel Fink, Mickael Montandon-Clerc

This year Mankind will release about 39 Gt carbon dioxide into the earth's atmosphere, where it acts as a greenhouse gas. The chemical transformation of carbon dioxide into useful products becomes increasingly important, as the CO2 concentration in the atm ...

Swiss Chemical Soc2015