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Littérature scientifique sur le sujet « Diphosphines synthesis »

Auteur : Grafiati

Publié le 21 décembre 2024

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Articles de revues sur le sujet "Diphosphines synthesis"

1

Thomson, RJ, WR Jackson, D. Haarburger, EI Klabunovsky et VA Pavlov. « The Stereochemistry of Organometallic Compounds. XXIX. Synthesis of Steroidal 1,4-Diphosphine, 1,3-Diphosphine and 1,6-Diphosphine and Their Evaluation as Ligands in Metal Catalyzed Asymmetric Synthesis ». Australian Journal of Chemistry 40, n^o 6 (1987) : 1083. http://dx.doi.org/10.1071/ch9871083.

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The steroidal 1,4-diphosphines 3α- and 3β-diphenylphosphino-2a-(2'-diphenylphosphinoethyl)-5α-cholestanes and their 5H-benzo[b] phosphindole derivatives have been prepared and shown to be useful ligands in asymmetric hydrogenation reactions. Interestingly the 3α- and 3β-derivatives lead to opposing enantioselection preferences when used in these reactions. A steroidal 1,3-diphosphine, 3α-diphenylphosphino-2α-diphenylphosphinomethyl-5α-cholestane, has been prepared as a mixture containing some of the 3β-epimer. The 3α-1,3-diphosphine led to similar enantioselection in hydrogenation reactions as the 3α-1,4-diphosphine, and a model is proposed to explain the sense of the enantioselectivity in the 1,4- and 1,3-diphosphines. A steroidal 1,6-diphosphine has also been prepared but leads to lower optical yields in the hydrogenation reactions. These ligands have been shown to lead to only poor to moderate optical yields when used in asymmetric carbon-carbon bond forming reactions.

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Ahmed S. M. Al-Janabi, Hayfa Muhammed Jerjes et Mohammed H. Salah. « Synthesis and characterization of new metal complexes of thione and phosphines Ligands ». Tikrit Journal of Pure Science 22, n^o 9 (1 février 2023) : 53–57. http://dx.doi.org/10.25130/tjps.v22i9.875.

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The complexes containing mixed of ligands [5-(3-chlorophenyl) -1,3,4-oxadiazole-2-thione(CPoxSH)] and diphosphines Ph2P(CH2)nPPh2 (diphos)(n=1-4), are prepared by the reaction of [Hg(CPoxS)2] or [M(H2O)2(CPoxS)2] (M = Co, Ni ) with one mole proportion of the diphosphine Ph2P(CH2)nPPh2 gave tetrahedral complexes of the type [Hg(CPoxS)2(diphos)]. While gave an octahedral complexes with cobalt(II) and nickel(II) ions of the type [M(H2O)(CPoxS)2(diphos)] when (M = Co and Ni ) receptivity. The prepared complexes were characterized by molar conductivity, elemental analysis, IR, 1H, 13C-{1H} and 31P-{1H} n.m.r.

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Quirmbach, Michael, Jens Holz, Vitali I. Tararov et Armin Börner. « Synthesis of Heterofunctionalized Multidentate Diphosphines ». Tetrahedron 56, n^o 5 (janvier 2000) : 775–80. http://dx.doi.org/10.1016/s0040-4020(99)01075-3.

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Lee, Kyounghoon, Courtney M. Donahue et Scott R. Daly. « Triaminoborane-bridged diphosphine complexes with Ni and Pd : coordination chemistry, structures, and ligand-centered reactivity ». Dalton Transactions 46, n^o 29 (2017) : 9394–406. http://dx.doi.org/10.1039/c7dt02144e.

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Zablocka, Maria, Nathalie Cénac, Alain Igau, Bruno Donnadieu, Jean-Pierre Majoral, Aleksandra Skowronska et Philippe Meunier. « Regioselective Synthesis of Tricyclic 1,1-Diphosphines ». Organometallics 15, n^o 25 (janvier 1996) : 5436–38. http://dx.doi.org/10.1021/om960545v.

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Zhou, Jianrong Steve, Siyu Guo, Xiaohu Zhao et Yonggui Robin Chi. « Nickel-catalyzed enantioselective umpolung hydrogenation for stereoselective synthesis of β-amido esters ». Chemical Communications 57, n^o 87 (2021) : 11501–4. http://dx.doi.org/10.1039/d1cc05257h.

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Louise Hazeland, E., Andy M. Chapman, Paul G. Pringle et Hazel A. Sparkes. « A one-step, modular route to optically-active diphos ligands ». Chemical Communications 51, n^o 50 (2015) : 10206–9. http://dx.doi.org/10.1039/c5cc03517a.

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A chlorosilane elimination reaction has been developed that allows the efficient synthesis of optically pure C₁-symmetric, C₁-backboned diphosphines with a wide variety of stereoelectronic characteristics.

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Burck, Sebastian, Imre Hajdók, Martin Nieger, Denis Bubrin, Simon Schulze, Dietrich Gudat et Dietrich Gudat. « Activation of Polarized Phosphorus–Phosphorus Bonds by Alkynes : Rational Synthesis of Unsymmetrical 1,2-Bisphosphine Ligands and Their Complexes ». Zeitschrift für Naturforschung B 64, n^o 1 (1 janvier 2009) : 63–72. http://dx.doi.org/10.1515/znb-2009-0109.

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The reactions of 1,1-diamino-2,2-diphenyl-substituted diphosphines featuring various degrees of P-P bond polarization with different alkynes were investigated. All diphosphines reacted with alkynes carrying one or two electron withdrawing carboxylic ester moieties under cleavage of the P-P bond and stereospecific phosphinyl-phosphination at the triple bond to give unsymmetrical ethane-1,2- bisphosphines. Several of the products were further converted into chelate complexes upon reaction with group-10 metal dihalides. All isolated compounds were characterized by analytical and spectroscopic data, and several of the new ligands and complexes by single-crystal X-ray diffraction studies.

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Knopf, Ioana, Daniel Tofan, Dirk Beetstra, Abdulaziz Al-Nezari, Khalid Al-Bahily et Christopher C. Cummins. « A family of cis-macrocyclic diphosphines : modular, stereoselective synthesis and application in catalytic CO2/ethylene coupling ». Chemical Science 8, n^o 2 (2017) : 1463–68. http://dx.doi.org/10.1039/c6sc03614g.

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The stereoselective synthesis of a family of cis-macrocyclic diphosphines was achieved in only three steps from white phosphorus and commercial materials. These new ligands showed activity in the nickel-catalyzed coupling of CO₂ and ethylene.

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Alder, Roger W., et David Read. « Medium-ring diphosphines : synthesis and transannular chemistry ». Coordination Chemistry Reviews 176, n^o 1 (septembre 1998) : 113–33. http://dx.doi.org/10.1016/s0010-8545(98)00114-3.

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Thèses sur le sujet "Diphosphines synthesis"

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Taylor, Peter Neil. « Synthesis and study of medium-ring diphosphines ». Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319096.

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Long, James Maurice. « Synthesis of new axially chiral diphosphines and phosphinamines for asymmetric catalysis ». Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337600.

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Woodworth, Patrick. « Synthesis and Analysis of Gold Nanoclusters ». VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5569.

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Gold Nanoclusters are of particular interest due to their many possible applications across a wide range of scientific fields. More specifically, nano-sized gold particles have potential to be used in drug delivery systems, cancer therapy and catalysis. This dissertation focuses on improving our understanding of ligated gold nanoclusters by examining the role of a variety of phosphine based ligands, novel methods to produce monodisperse solutions, and investigating the kinetics of water soluble ligated gold nanoclusters. The addition of ligands to solutions of Au have shown to produce small (< 20 Au atoms) clusters. All nanocluster solutions were prepared in a similar manner. Typically, a gold salt, either Chloro(triphenylphosphine) gold(I) (Au(PPh3)Cl), or Potassium gold (III) chloride (KAuCl4), were dissolved in various solvents. Next, an equal concentration of ligand was added to the solution and stirred until completely dissolved. Finally, all were reduced with 5X the concentration of borane-tert-butylamine (BTBC) after which were sonicated for ~20 minutes. The timing and method of adding the ligands and reducing agent varied depending on the solution and solubility of the ligands. Primarily we used Electrospray Ionization Mass Spectrometry (ESI-MS) and Ultraviolet – Visible Spectroscopy (UV-VIS) for the characterization of samples, however, occasionally Transmission Electron Microscopy (TEM), X-Ray Diffraction (XRD) and X-Ray Photoemission Spectroscopy (XPS) were used. The most recent research took advantage of the size selective nature of an alpha hemolysin (a-HL) nanopore to investigate the kinetics of thiol-ligated Au clusters ~2 nm in size. The relationship between ligand rigidity and solvent polarity and the size and dispersity of Au cluster suspensions was investigated. We observed the formation of stable monodisperse clusters with the shortest ligand, (L3), independent of solvent. With a longer flexible ligand, (L6), we observed primarily Au8-10 cores depending on the ratio of L6/PPh3. All other ligands yielded polydisperse distributions. These dispersions contained clusters with a nuclearity between 8 and 11, for example [Au10(PPh3)9]3+ in LBn and [Au8(PPh3)7]2+ in LBp, were observed in the initial stages, but they were not stable and precipitated out or plated the glass vial. We also observed that the polarity of the solvent did not play a significant role in the formation of MPC’s, however a correlation between the size of the solvent and MPC formation was observed. The growth and evolution of two unique gold structures was also observed via UV-Vis and ESI-MS. Solutions were prepared which contained Potassium gold (III) chloride and PPh2(CH2)3PPh2, i.e., 1,3-bis(diphenylphosphino)propane, denoted by L3, reduced with Borane tert-butylamine complex (BTBC) in a 1:1 diethyl ether:methanol mix, which yielded a stable [Au11(L3)5]+3. Starting with this known Au11 solution, the addition of Mn2+ has shown to lead to the formation of a stable diphosphine ligated Au8 and a new Au14 species. Additionally, we show that the co-reduction of NiCl2 and Au in the absence of the ligand (L3) does give us a simple method for the production of a monodisperse [Au9(PPh3)8]2+ cluster solution and via electroless deposition does give us a potential low temperature pathway to the formation of a AuNi nanoalloy particle.

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Leonard, Thomas Ralph. « New diphosphanes and their application in the synthesis of rigid backboned diphosphines ». Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.529843.

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Lam, Tun Chiao Hubert. « Synthesis of chiral amino (amido) diphosphines and applications in palladium catalyzed asymmetric processes ». Thesis, King's College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398250.

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Ekanayake, Dewmi A. « Copper Hydride Clusters Stabilized by NH-Centered Diphosphines : Synthesis, Structures, and Implications in Catalysis ». University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1626356614867446.

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Marsh, Paul Samuel. « Synthesis, characterisation and precious metal chemistry of symmetrical and unsymmetrical diphosphines based on 9-phosphabicyclononanes ». Thesis, University of Bristol, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289719.

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Zwart, Guilhem. « Hydrogénolyse de (pseudo-)haloboranes et de chlorophosphines ». Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF049.

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Cette thèse examine les défis posés par l’accès incertain aux éléments chimiques, exacerbée par un paradigme économique linéaire de leur exploitation. L’étude se concentre sur le bore et le phosphore, dont l’utilisation et le recyclage restent sous-étudiés. Le bore, crucial dans diverses industries, nécessite des processus énergivores pour être transformé en hydroboranes actifs, utilisés en chimie fine. Deux voies existent pour leur synthèse : la méthode industrielle à partir de borate, et la réaction de BCl₃ avec un donneur d’hydrure. Utiliser H₂ comme agent réducteur pourrait améliorer ces processus. Cette recherche explore la synthèse d’hydroboranes [9-BBN]₂ et [Cy₂BH]₂ à partir de leurs dérivés halogénés et triflate, avec une base et H₂. Le criblage des bases a montré que les trialkylamines, surtout NEt₃, sont efficaces. La réaction repose sur un mécanisme type paire de Lewis frustrée pour activer le H₂. Il s’avère également que les dialkylboranes peuvent catalyser l’hydrogénolyse d’autres chloroboranes, en particulier de BCl₃, permettant d’obtenir HCl₂B·NEt₃ et H₂ClB · NEt₃. Enfin, cette stratégie a été étendue au phosphore, optimisant l’hydrogénolyse des chlorophosphines en diphosphines. La méthode, efficace pour divers substrats, procède en trois étapes : hydrogénolyse du catalyseur, transfert d’hydrure, et condensation en diphosphine, assistée par NEt₃. Ces transformations ont été modélisées chaque fois par théorie de la fonctionnelle de la densité (DFT) et présentent des temps de réactions souvent longs (jusqu’à plusieurs jours), mais avec en général de bons rendements (> 70 %) en conditions douces de pression et température
This thesis examines the challenges posed by uncertain access to chemical elements, exacerbated by a linear economic paradigm of their exploitation. The study focuses on boron and phosphorus, whose usage and recycling remain understudied. Boron, crucial in various industries, requires energy-intensive processes to be converted into active hydroboranes, used in fine chemistry. Two methods exist for their synthesis: the industrial method from borate, and the reaction of BCl₃ with a hydride donor. Using H₂ as a reducing agent could improve these processes. This research explores the synthesis of hydroboranes [9-BBN]₂ and [Cy₂BH]₂ from their halogenated and triflate derivatives, with a base and H₂. Base screening showed that trialkylamines, particularly NEt₃, are effective. The reaction relies on a frustrated Lewis pair mechanism to activate H₂. It was also found that dialkylboranes can catalyze the hydrogenolysis of other chloroboranes, particularly BCl₃, yielding HCl₂B· NEt₃ and H₂ClB·NEt₃. Finally, this strategy was extended to phosphorus, optimizing the hydrogenolysis of chlorophosphines into diphosphines. The method, effective for various substrates, proceeds in three steps : catalyst hydrogenolysis, hydride transfer, and base-assisted condensation into diphosphine. These transformations were modeled each time using density functional theory (DFT) and often present long reaction times (up to several days), but usually with good yields (> 70 %) under mild pressure and temperature conditions

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Gramage-Doria, Rafael. « Large cavity cyclodextrin-based macrocyclic ligands : synthesis, coordination and catalytic properties ». Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00767168.

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Cyclodextrins (CDs) are cyclic oligosaccharides of various sizes containing several α-(1→4)-linked D-(+)- glucopyranose units. The commercially available ones comprise six, seven or eight glucose units, named respectively α-CD, β-CD and γ-CD. Their truncated cone-like and well-defined cavity are particularly attractive for the encapsulation of a variety of substrates. As such, they found numerous applications in many areas of chemistry. A recent development, from which the present work is inspired, consisted in covalently linking transition metals to CD cavities in order to perform and study catalytic reactions in a confined environment featuring steric repulsive or attractive noncovalent interactions with the substrate or/and the metal coordination sphere.The first part of this thesis focuses on reviewing transition metal-based cavitands, for which the first and second metal coordination spheres are controlled by their cavity-shaped ligand. The following chapters are concerned with the synthesis, coordination and catalytic properties of two new phosphane ligands built on a large β-CD scaffold. The first one, named WIDEPHOS, is a diphosphine having two phenylphosphinidene "PPh" units capping adjacent glucose units on a methylated β-CD. This ligand features two phosphorus lone pairs pointing to the cavity interior but not aligned. These geometrical features, combined with the large distance separating the two phosphorus atoms, promote the formation of "imperfect" trans-chelate complexes in which the metal centre swings about the ligand. This unprecedented molecular movement, christened "oschelation", allows each phosphorus atom to form an optimal bond in turn with the coordinated d8 and d10 transition metal ions. Further studies on WIDEPHOS proved that it is better suited for coordinating dinuclear fragments within the confinement of the large β-CD cavity. Severe steric constrains on the metal first sphere of coordination result in the formation of single μ-chlorido bridged dinuclear species. In this new type of square planar complexes, non-optimal orbital overlapping measured by the so-called tilt angle was also found to take place for one of the phosphorus atom together with an "oschelation" movement involving non identical donor atoms, namely a phosphorus and an oxygen atom. Static gold(I) dinuclear complexes displaying similar imperfect orbital overlapping for one of the phosphorus atom were also prepared.

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Fiedler, Tobias [Verfasser], et John A. [Akademischer Betreuer] Gladysz. « Syntheses of Gyroscope-like Osmium Complexes and Cage-like Diphosphines = Synthese gyroskopartiger Osmiumkomplexe und käfigartiger Diphosphine / Tobias Fiedler. Betreuer : John A. Gladysz ». Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2011. http://d-nb.info/1015475116/34.

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Livres sur le sujet "Diphosphines synthesis"

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Gorla, Fabrizio Giovanni. Synthese chiraler Platin(II)-Komplexe mit dreizähnig koordinierten Diphosphinen und ihre katalytischen Anwendungen. 1993.

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Rahman, A. B. M. Shamsur. The properties of zerovalent nickel-carbonyl-diphosphine complexes and their application to the synthesis ofheterobimetallic systems. 1993.

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Chapitres de livres sur le sujet "Diphosphines synthesis"

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Li, Wei, et Xumu Zhang. « Chiral Phosphines and Diphosphines ». Dans Phosphorus(III) Ligands in Homogeneous Catalysis : Design and Synthesis, 27–80. Chichester, UK : John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118299715.ch2.

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Donohue, P. C., J. Ferretti et A. Wold. « Pyrite Type of Silicon Diphosphide ». Dans Inorganic Syntheses, 173–76. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132456.ch36.

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Longato, B., B. Corain, G. M. Bonora, G. Valle et G. Pilloni. « Cis-Diphosphine Platinum(II) Complexes with Pyrimydil Nucleosides : Synthesis, Characterization and Structural Studies ». Dans Platinum and Other Metal Coordination Compounds in Cancer Chemotherapy, 705–13. Boston, MA : Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-1717-3_80.

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van Leeuwen, P. W. N. M. « Carbonylation Using Diphosphine Ligands ». Dans Stereoselective Synthesis 1 Stereoselective Reactions of Carbon—Carbon Double Bonds, 1. Georg Thieme Verlag KG, 2011. http://dx.doi.org/10.1055/sos-sd-201-00236.

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Yamashita, M. « 6.1.45 Diphosphino–Boryl (PBP) Pincer Complexes ». Dans Knowledge Updates 2023/2. Stuttgart : Georg Thieme Verlag KG, 2024. http://dx.doi.org/10.1055/sos-sd-106-00343.

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AbstractTransition-metal–boryl complexes having a covalent B-M bond have been considered as reactive intermediates in transition-metal-catalyzed borylative transformation of organic molecules. However, monodentate, anionic boryl ligands are not appropriate for use as supporting ligands, because they readily dissociate from the metal center. Since the first reports of transition-metal complexes possessing a pincer ligand involving boron and two coordinating sidearms, the chemistry of phosphorus-tethered PBP-pincer complexes has gradually developed. This review focuses on the synthesis of PBP-pincer complexes, their structure, elementary reactions, and applications in catalytic transformations of organic molecules.

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« Chapter 18 Application of Palladium(II) Diphosphine Catalysts in the Alternating Copolymerization of Ethene with Carbon Monoxide ». Dans Synthetic Methods of Organometallic and Inorganic Chemistry, sous la direction de Wolfgang A. Hellmann. Stuttgart : Georg Thieme Verlag, 2002. http://dx.doi.org/10.1055/b-0035-108644.

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Actes de conférences sur le sujet "Diphosphines synthesis"

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Romarís, Pablo, Jose Manuel Vila, Fátima Lucio-Martínez, Francisco Reigosa, Paula Munín, Paula Polo-Ces et Maria Teresa Pereira. « Synthesis of a dinuclear palladacycle with a doubly metallated ligand and its reactivity towards diphosphines ». Dans The 22nd International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2018. http://dx.doi.org/10.3390/ecsoc-22-05684.

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Kmieciak, Anna, Monika Kołodziej et Marek Krzemiński. « SYNTHESIS OF NEW CHIRAL DIPHOSPHINES LIGANDS PINENE DERIVATIVES AND THEIR APPLICATION IN ENANTIOSELECTIVE REACTIONS ». Dans The 20th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2016. http://dx.doi.org/10.3390/ecsoc-20-a044.

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Saleh, R. A., H. A. Mohammad, T. I. Gerber et E. C. Hosten. « Synthesis and characterization of mono and mixed ligand, Ni(II), Pd(II) and Pt(II) complexes of S-5-phenyl-1, 3, 4-oxadiazole-2-yl benzothioate with some tertiary diphosphines ligands ». Dans 6TH INTERNATIONAL CONFERENCE AND WORKSHOPS ON BASIC AND APPLIED SCIENCES. Author(s), 2017. http://dx.doi.org/10.1063/1.5004324.

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Bermudez, Sara, Raquel Diz-Gil, Paula Munín-Cruz, Marcos Rúa-Sueiro, Juan Ortigueira et José Vila. « Preparation of novel complexes bearing diphosphine (dppm) derived from thiosemicarbazone palladacycles ». Dans The 24th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland : MDPI, 2020. http://dx.doi.org/10.3390/ecsoc-24-08320.

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