Search results for: József Bakos

Items from 1 to 20 out of 43 results

article

Ruthenium complexes of new chiral phosphine‐amine‐ether ligands (Ru‐PNO) for asymmetric hydrogenation – the role of backbone chirality in pincer ligand design

Zsófia Császár, Zsanett E. Pőrgye, Evelin Tóth‐Farsang, Margit Kovács, more

Applied Organometallic Chemistry > 38 > 3 > n/a - n/a

New chiral phosphine‐amine‐ether (PNO) ligands of the general formula Ph₂PCH(R¹)(CH₂)_nCH(R¹)N(R²)CH(R³)CH₂OMe, where R¹, R², and R³ = H or Me, n = 0 or 1, and their ruthenium complexes of the type [RuCl₂(PPh₃)(PNO)] have been synthesized. The coordination compounds were characterized by 1D and 2D NMR spectroscopy, modeled by DFT calculations, and in one case analyzed by X‐ray crystallography. The...

article

Double stereoselective coordination of chiral N,S ligands: Synthesis, coordination chemistry and utilization in Pd‐catalyzed allylic alkylation

Máté Miklós Major, Gergő Rövid, Szabolcs Balogh, Attila Bényei, more

Applied Organometallic Chemistry > 33 > 2 > n/a - n/a

A series of chiral pentane‐2,4‐diyl‐based thioether‐amine ligands [4 and 5; (R,S)‐ and (S,S)‐R¹SCH(CH₃)CH₂CH(CH₃)NHR², respectively, where 4a R¹ = iPr, R² = Ph; 4b R¹ = tBu, R² = Ph; 4c R¹ = 1‐Ad, R² = Ph; 5a R¹ = iPr, R² = Ph; 5b R¹ = tBu, R² = Ph; 5c R¹ = 1‐Ad, R² = Ph; 5d R¹ = iPr, R² = 4‐MeOC₆H₄; 5e R¹ = iPr, R² = 4‐MeC₆H₄; 5f R¹ = iPr, R² = 3,5‐Me₂C₆H₃] with stereogenic S‐ and N‐donor atoms has...

article

Steric effects enforce double stereoselective N-coordination in twelve-membered binuclear palladium(II)-complexes containing chiral bridging aminoalkyl-phosphine ligands

Zsófia Császár, Kristóf Stágel, Szabolcs Balogh, Attila Bényei, more

Journal of Organometallic Chemistry > 2018 > 855 > C > 59-62

The configuration of the ligand's N-substituent was found to determine the stoichiometry and strict stereoselectivity of N-coordination in twelve-membered palladium dimers 2a-b. The novel palladium(II)-complexes 2a-b have been synthesized in the reaction of [Pd(COD)Cl₂] and optically pure (S,S)-pentane-2,4-diyl based aminoalkyl-phosphine ligands Ph₂PCH(CH₃)CH₂CH(CH₃)NHR 1a-b (R = (R)-α-phenylethyl...

article

Immobilized phosphine–phosphite rhodium complexes: highly active and enantioselective catalysts for asymmetric hydrogenation under continuous flow conditions

József Madarász, Balázs Nánási, József Kovács, Szabolcs Balogh, more

Monatshefte für Chemie - Chemical Monthly > 2018 > 149 > 1 > 19-25

The asymmetric hydrogenation of benchmark substrates dimethyl itaconate and (Z)-α-acetamidocinnamic acid methyl ester with chiral pentane-2,4-diyl-based phosphine–phosphite Rh complexes immobilized on the support with heteropolyacid (phosphotungstic acid) as anchoring agent has been studied. The complexes have been supported on commercially available Al₂O₃ by the Augustine method. The novel heterogeneous...

article

Aminoalkyl-phosphine (P,N) ligands with pentane-2,4-diyl backbone in asymmetric allylic substitution reactions

Zsófia Császár, Patrik Imre, Szabolcs Balogh, Attila Bényei, more

Monatshefte für Chemie - Chemical Monthly > 2017 > 148 > 12 > 2069-2077

The asymmetric allylic substitution reaction of rac-1,3-diaryl-2-propenyl acetates with several C- and N-nucleophiles catalyzed by the palladium-complexes of eleven structurally analogous aminoalkyl-phosphines (P,N) with pentane-2,4-diyl backbone is reported. The role of the N-substituents and the influence of the ligand/palladium molar ratio on the activity and enantioselectivity of the catalytic...

article

Detecting the non-ionizing radiation induced genotoxicity by the Comet assay method

Zsuzsanna Németh, Györgyi Kubinyi, Annamária Brech, Erzsébet Laczkovich-Szaladják, more

Toxicology Letters > 2017 > 280 > S1 > S258

article

Efficient stereochemical communication in phosphine-amine palladium-complexes: Exploration of N-substituent effects in coordination chemistry and catalysis

Gergely Farkas, Zsófia Császár, Kristóf Stágel, Evelin Nemes, more

Journal of Organometallic Chemistry > 2017 > 846 > C > 129-140

Six-membered chelate complexes of type [Pd(1a-e)Cl₂] (2a-e) and [Pd(1a-e)(η³-PhCHCHCHPh)]BF₄ (3a-e) of a series of systematically varied chiral phosphine-amine ligands (S,S)-Ph₂PCH(CH₃)CH₂CH(CH₃)NHR 1a-e (R = benzyl 1a, R = ethyl 1b, R = (S)-α-phenylethyl 1c, R = isopropyl 1d, R = methyl 1e) have been studied. The complexes 2a-e were characterized by X-ray crystallography, DFT analysis and in solution...

article

Synthesis of new N-substituted chiral phosphine–phosphoramidite ligands and their application in asymmetric hydrogenations and allylic alkylations

Szabolcs Balogh, Gergely Farkas, Imre Tóth, József Bakos

Tetrahedron: Asymmetry > 2015 > 26 > 12-13 > 666-673

Phosphine–phosphoramidite ligands containing a 2,4-pentanediyl backbone, BINOL moieties, and Me, Bn or Ph substituent on the nitrogen were synthesized and fully characterized. The electronic effect of the N-substituents was examined by ³¹P NMR of their corresponding seleno-phosphate-amide and phosphine–selenide derivatives. The new ligands together with their earlier reported derivatives were tested...

article

Evaluation of SILP-Pd catalysts for Heck reactions in a microfluidics-based high throughput flow reactor

Béla Urbán, Dávid Srankó, György Sáfrán, László Ürge, more

Journal of Molecular Catalysis. A, Chemical > 2014 > 395 > Complete > 364-372

Heck reaction of aryl iodides and methyl acrylate was carried out in an X-Cube™ reactor in the presence of supported catalysts. Palladium was immobilised by different methods on silica with covalently grafted ionic liquid moieties. Activity and selectivity of the SILP-Pd (supported ionic liquid phase) catalysts were found to depend greatly on the conditions (such as solvent and additives) of immobilisation...

article

Effects of laser treatment on the expression of cytosolic proteins in the synovium of patients with osteoarthritis

Klára Barabás, József Bakos, Zsuzsanna Zeitler, Géza Bálint, more

Lasers in Surgery and Medicine > 46 > 8 > 644 - 649

Background and ObjectiveLow level laser therapy (LLLT) has been developed for non‐invasive treatment of joint diseases. We have previously shown that LLLT influenced synovial protein expression in rheumatoid arthritis (RA). The aim of this study was to assess the effects of laser irradiation on osteoarthritic (OA) synovial protein expression. Study Design/Materials and methodsThe synovial membrane...

article

Synthesis of hemilabile P,N-ligands with a pentane-2,4-diyl backbone

Gergely Farkas, Zsófia Császár, Szabolcs Balogh, Imre Tóth, more

Tetrahedron Letters > 2014 > 55 > 30 > 4120-4122

A general and convenient two-step synthetic method has been developed for the preparation of a novel class of aminoalkyl-phosphine type compounds, which involves nucleophilic ring-opening of cyclic sulfate esters. The ring-opening step was performed using several different aliphatic and aromatic amines to produce aminoalkyl sulfates that were reacted with LiPPh₂ to give the corresponding P,N-ligands...

article

Pre-excitation studies for rubidium-plasma generation

Márk Aladi, József Bakos, I.F. Barna, Aladár Czitrovszky, more

Nuclear Inst. and Methods in Physics Research, A > 2014 > 740 > Complete > 203-207

The key element in the Proton-Driven-Plasma-Wake-Field-Accelerator (PWFA) project is the generation of highly uniform plasma from Rubidium vapor. A scientifically straightforward, yet highly challenging way to achieve full ionization is to use high power laser which can assure the barrier suppression ionization (BSI) along the 10m long active region. The Wigner-team in Budapest is investigating an...

article

Photobiological safety of the recently introduced energy efficient household lamps

Péter Pál Necz, József Bakos

International Journal of Occupational Medicine and Environmental Health > 2014 > 27 > 6 > 1036-1042

Objectives Nowadays more and more newly introduced light sources (tungsten-halogen, compact fluorescent (CFL) and light-emitting diode (LED) lamps) are used in households. It is important to know whether their radiation poses any possible risk for human health or not. These light sources emit optical radiation not solely in the visible spectrum. Other bands emitted by these sources, i.e., ultraviolet...

article

Photobiological safety of the recently introduced energy efficient household lamps

Péter P. Necz, József Bakos

International Journal of Occupational Medicine and Environmental Health > 2014 > 27 > 6 > 1036-1042

Objectives: Nowadays more and more newly introduced light sources (tungsten-halogen, compact fluorescent (CFL) and light-emitting diode (LED) lamps) are used in households. It is important to know whether their radiation poses any possible risk for human health or not. These light sources emit optical radiation not solely in the visible spectrum. Other bands emitted by these sources, i.e., ultraviolet...

article

Phosphine–phosphite ligands in the palladium-catalyzed asymmetric allylic alkylation: Electronic and steric effects

Gergely Farkas, Zsófia Császár, Szabolcs Balogh, Áron Szöllősy, more

Catalysis Communications > 2013 > 36 > Complete > 94-97

The asymmetric allylic alkylation of rac-1,3-diphenyl-2-propenyl acetate catalyzed by the palladium-complexes of phosphine–phosphite ligands with 1,1'-binaphthyl- or 1,1'-octahydrobinaphthyl- moiety is reported. The roles of (i) the tether length in directly analogous phosphine–phosphite ligands, (ii) the stereogenic elements in the backbone of PC ₃ OP type of ligands, and (iii) the BINOL...

article

Fine tuning of the structure of phosphine–phosphoramidites: application for rhodium-catalyzed asymmetric hydrogenations

Szabolcs Balogh, Gergely Farkas, Áron Szöllősy, Ferenc Darvas, more

Tetrahedron: Asymmetry > 2013 > 24 > 1 > 66-74

Diastereomers of (4-(diphenylphosphino)pentan-2-yl)-N-isopropyl-{dinaphtho[2,1-d:1′,2′-f][1,3,2]dioxa-phosphepin-2-yl}-4-amine, (S)-(2S,4S)-1, and (S)-(2R,4R)-3; the octahydro derivative 4 of (S)-(2S,4S)-1, and derivative 2 of (S)-(2S,4S)-1 containing a 1,3-propanediyl backbone, have been synthesized and used for rhodium-catalyzed asymmetric hydrogenations of prochiral olefins in order to study the...

article

Novel phosphine–phosphites and their use in asymmetric hydrogenation

Gergely Farkas, Szabolcs Balogh, Áron Szöllősy, László Ürge, more

Tetrahedron: Asymmetry > 2011 > 22 > 24 > 2104-2109

Excellent enantioselectivities and activities have been obtained in the rhodium catalyzed asymmetric hydrogenation of dimethyl itaconate and several dehydroamino acid esters using a new class of BINOL based phosphine–phosphite ligand. The hydrogenation proceeded efficiently even at a substrate/catalyst molar ratio of 10,000 to give the product with 100% conversion and 99.1% enantioselectivity.

article

A Continuous-Flow System for Asymmetric Hydrogenation Using Supported Chiral Catalysts

József Madarász, Gergely Farkas, Szabolcs Balogh, Áron Szölloősy, more

Journal of Flow Chemistry > 2011 > 1 > 2 > 62-67

Highly active immobilized hydrogenation catalytic systems were used in the H-Cube™ hydrogenation reactor. “In situ” produced [Rh(COD)((S)-MonoPhos)₂]BF₄ complex was immobilized on commercially available Al₂O₃ and mesoporous Al₂O₃ by means of phosphotungstic acid (PTA), respectively. The optimum reaction conditions were determined and studied at different temperature, pressure, and flow rate values...

article

RF personal exposimetry on employees of elementary schools, kindergartens and day nurseries as a proxy for child exposures

Péter Juhász, József Bakos, Noémi Nagy, Gábor Jánossy, more

Progress in Biophysics and Molecular Biology > 2011 > 107 > 3 > 449-455

Personal RF exposimetry has been in the focus of the bioelectromagnetics community in the last few years. With a few exceptions, exposimetry studies focused on adults, because measuring the exposure of children, one of the most important target groups, introduces many complications.The main feature of our study is to select teachers and kindergarten caretakers as volunteers. They are expected to receive...

article

Palladium-catalysed reactions of 6-halogeno-1,1′-binaphthyl derivatives. A detailed investigation of structure/reactivity and structure/selectivity relationships

Csaba Fehér, Béla Urbán, László Ürge, Ferenc Darvas, more

Tetrahedron > 2011 > 67 > 34 > 6327-6333

Five 6-halogeno-binaphthyl derivatives of different structure were synthesised starting from 2,2′-dihydroxy-1,1′-binaphthyl 1. Several new 6-substituted binaphthyl compounds were obtained via the palladium-catalysed reactions of these derivatives. The reactivity of 6-iodo derivatives was much greater in most cases. In cross-coupling reactions the 6-bromo compounds were converted into the products...

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Search results for: József Bakos

Ruthenium complexes of new chiral phosphine‐amine‐ether ligands (Ru‐PNO) for asymmetric hydrogenation – the role of backbone chirality in pincer ligand design

Double stereoselective coordination of chiral N,S ligands: Synthesis, coordination chemistry and utilization in Pd‐catalyzed allylic alkylation

Steric effects enforce double stereoselective N-coordination in twelve-membered binuclear palladium(II)-complexes containing chiral bridging aminoalkyl-phosphine ligands

Immobilized phosphine–phosphite rhodium complexes: highly active and enantioselective catalysts for asymmetric hydrogenation under continuous flow conditions

Aminoalkyl-phosphine (P,N) ligands with pentane-2,4-diyl backbone in asymmetric allylic substitution reactions

Detecting the non-ionizing radiation induced genotoxicity by the Comet assay method

Efficient stereochemical communication in phosphine-amine palladium-complexes: Exploration of N-substituent effects in coordination chemistry and catalysis

Synthesis of new N-substituted chiral phosphine–phosphoramidite ligands and their application in asymmetric hydrogenations and allylic alkylations

Evaluation of SILP-Pd catalysts for Heck reactions in a microfluidics-based high throughput flow reactor

Effects of laser treatment on the expression of cytosolic proteins in the synovium of patients with osteoarthritis

Synthesis of hemilabile P,N-ligands with a pentane-2,4-diyl backbone

Pre-excitation studies for rubidium-plasma generation

Photobiological safety of the recently introduced energy efficient household lamps

Photobiological safety of the recently introduced energy efficient household lamps

Phosphine–phosphite ligands in the palladium-catalyzed asymmetric allylic alkylation: Electronic and steric effects

Fine tuning of the structure of phosphine–phosphoramidites: application for rhodium-catalyzed asymmetric hydrogenations

Novel phosphine–phosphites and their use in asymmetric hydrogenation

A Continuous-Flow System for Asymmetric Hydrogenation Using Supported Chiral Catalysts

RF personal exposimetry on employees of elementary schools, kindergartens and day nurseries as a proxy for child exposures

Palladium-catalysed reactions of 6-halogeno-1,1′-binaphthyl derivatives. A detailed investigation of structure/reactivity and structure/selectivity relationships

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