Relevant bibliographies by topics / Hemilabile phosphine ligands

Academic literature on the topic 'Hemilabile phosphine ligands'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Hemilabile phosphine ligands"

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Keim, Wilhelm, Heiko Maas, and Stefan Mecking. "Palladium Catalyzed Alternating Cooligomerization of Ethylene and Carbon Monoxide to Unsaturated Ketones." Zeitschrift für Naturforschung B 50, no. 3 (March 1, 1995): 430–38. http://dx.doi.org/10.1515/znb-1995-0318.

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Cationic palladium catalysts have been used to cooligomerize ethylene and carbon monoxide. At high ethylene/CO ratios (m /m = 10:1) in methylene chloride as a solvent, unsaturated alternating cooligomers of the general structure R[C(O)CH2CH2]mH ( m ≥ 1 ; R ≡CH2=CH-, CH2=CHCH2CH2- and CH3CH = CHCH2-) were obtained for the first time. Single component catalyst precursors [(allyl)Pd(P^X )]+Y- (P^X = Ph2P(CH2)nC(= O )OR, Ph2P(CH2)2P(=O)Ph2, Ph2P(CH2)nPh2P(CH2)2S (=O )Ph, n = 1 - 3 , R = Me, Et; Y- = BF4-, SbF6- ) with bidentate P,O- and P,S-ligands as well as in situ catalysts with unfunctionalized phosphine ligands were used. With P"Bu3 as a ligand, selectivities for ethylvinylketone of 40% based on the CO converted were obtained. The hemilabile phosphino-ester and phosphinothiophene ligands behave like monodentate phosphines under catalytic conditions.
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Sharma, Anuja, and Ryan J. Trovitch. "Phosphorous-substituted redox-active ligands in base metal hydrosilylation catalysis." Dalton Transactions 50, no. 44 (2021): 15973–77. http://dx.doi.org/10.1039/d1dt02879k.

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Gushchin, Artem L., Nikita Y. Shmelev, Svetlana F. Malysheva, Alexander V. Artem’ev, Nataliya A. Belogorlova, Pavel A. Abramov, Nikolay B. Kompan’kov, et al. "Hemilability of phosphine-thioether ligands coordinated to trinuclear Mo3S4 cluster and its effect on hydrogenation catalysis." New Journal of Chemistry 42, no. 21 (2018): 17708–17. http://dx.doi.org/10.1039/c8nj03720e.

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Phosphine-thioether ligands were coordinated to the Mo3S4 cluster to afford [Mo3S4Cl3(PS)3]+ complexes. Their catalytic activity in nitrobenzene reduction reflects the different hemilabile behaviours of PS1, PS2 and PS3.
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Jung, Stefan, Carsten D. Brandt, and Helmut Werner. "A cationic allenylideneruthenium(II) complex with two bulky hemilabile phosphine ligands." New Journal of Chemistry 25, no. 9 (2001): 1101–3. http://dx.doi.org/10.1039/b104787f.

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Clot, Olivier, Michael O. Wolf, Glenn P. A. Yap, and Brian O. Patrick. "Synthesis and reactivity of ruthenium(II) complexes containing hemilabile phosphine–thiophene ligands." Journal of the Chemical Society, Dalton Transactions, no. 16 (2000): 2729–37. http://dx.doi.org/10.1039/b001898h.

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Angell, Sarah E., Yan Zhang, Cerrie W. Rogers, Michael O. Wolf, and Wayne E. Jones. "Photophysical Properties of Ru(II) Bipyridyl Complexes Containing Hemilabile Phosphine−Ether Ligands." Inorganic Chemistry 44, no. 21 (October 2005): 7377–84. http://dx.doi.org/10.1021/ic050436l.

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Tole, Tegene T., Johannes H. L. Jordaan, and Hermanus C. M. Vosloo. "α-Pyridinyl Alcohols, α,α’-Pyridine Diols, α-Bipyridinyl Alcohols, and α,α’-Bipyridine Diols as Structure Motifs Towards Important Organic Molecules and Transition Metal Complexes." Current Organic Synthesis 17, no. 5 (July 27, 2020): 344–66. http://dx.doi.org/10.2174/1570179417666200212111049.

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Background: The preparation and use of pyridinyl alcohols as ligands showed incredible increment in the past three decades. Important property of pyridinyl alcoholato ligands is their strong basicity, which is mainly due to the lack of resonance stabilization of the corresponding anion. This strongly basic anionic nature gives them high ability to make bridges between metal centers rather than to bind to only one metal center in a terminal fashion. They are needed as ligands due to their ability to interact with transition metals both covalently (with oxygen) and hemilabile coordination (through nitrogen). Objective: The review focuses on the wide application of α-pyridinyl alcohols, α,α’-pyridine diols, α- bipyridinyl alcohols, and α,α’-bipyridine diols as structure motifs in the preparation of important organic molecules which is due to their strongly basic anionic nature. Conclusion: It is clear from the review that in addition to their synthetic utility in the homogeneous and asymmetric catalytic reactions, the preparation of the crown ethers, cyclic and acyclic ethers, coordinated borates (boronic esters), pyridinyl-phosphine ligands, pyridinyl-phosphite ligands, and pyridinyl-phosphinite ligands is the other broad area of application of pyridinyl alcohols. In addition to the aforementioned applications they are used for modeling mode of action of enzymes and some therapeutic agents. Their strongly basic anionic nature gives them high ability to make bridges between metal centers rather than to bind to only one metal center in a terminal fashion in the synthesis of transition metal cluster complexes. Not least numbers of single molecule magnets that can be used as storage of high density information were the result of transition metal complexes of pyridinyl alcoholato ligands.
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Grushin, Vladimir V. "Synthesis of Hemilabile Phosphine−Phosphine Oxide Ligands via the Highly Selective Pd-Catalyzed Mono-oxidation of Bidentate Phosphines: Scope, Limitations, and Mechanism." Organometallics 20, no. 18 (September 2001): 3950–61. http://dx.doi.org/10.1021/om010454k.

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Cadierno, Victorio, Josefina Díez, Sergio E. García-Garrido, Santiago García-Granda, and José Gimeno. "Ruthenium(ii) and ruthenium(iv) complexes containing hemilabile heterodifunctional iminophosphorane-phosphine ligands Ph2PCH2P(NR)Ph2." Journal of the Chemical Society, Dalton Transactions, no. 7 (2002): 1465. http://dx.doi.org/10.1039/b110442j.

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Caballero, Agustín, Félix A. Jalón, Blanca R. Manzano, Gustavo Espino, Mercedes Pérez-Manrique, Antonio Mucientes, Francisco J. Poblete, and Miguel Maestro. "Ruthenium Arene Derivatives with PN Hemilabile Ligands. P−C Cleavage and Phosphine to Phosphinite Transformation." Organometallics 23, no. 24 (November 2004): 5694–706. http://dx.doi.org/10.1021/om049438o.

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Dissertations / Theses on the topic "Hemilabile phosphine ligands"

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Noack, Cassandra, and n/a. "Studies in Coordination Chemistry." Griffith University. School of Science, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031030.145610.

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The research reported in this thesis was carried out in Brisbane, Australia and Calgary, Canada. The aim of the research conducted in Brisbane was to prepare a series of copper(I) and ruthenium(II) based complexes incorporating a hemilabile phosphine ligand and to determine whether or not these compounds possessed catalytic activity. The history, uses, properties and recent work incorporating hemilabile phosphine ligands is discussed in detail as well as the application of hemilabile ligands to atom transfer radical polymerization (ATRP) and the usefulness of the 'windscreen wiper' action of these ligands in polymerization. The literature synthesis and characterization of four hemilabile phosphine ligands is reported with modifications. The (2-chlorophenyl)diphenylphosphine ligand was prepared via a Grignard reaction giving a 11% yield. The (2-bromophenyl) diphenylphosphine ligand was prepared by reaction of 2-bromoiodobenzene with Ph2PSiMe3 in the presence of a palladium catalyst (MeCN)2PdCl2 which yielded 50% product. The 1-chloro-2-diphenylphosphinoethane ligand was prepared following the generation of a lithium diphenylphosphide which was added to 1,2-dichloroethane to give a 43% yield of product. The (2-benzoic-acid)diphenylphosphine ligand was prepared by hydrolysis of (2-methyl-ester-phenyl)diphenylphosphine. Following acidification of the methyl ester phosphine with HCl, the desired product was isolated in 88% yield. The synthesis and characterization of a series of copper(I) based complexes incorporating the prepared phosphine ligands involved reaction in CH3CN of the appropriate ligand with copper halides as starting material. Solution state 31P NMR and mass spectrometry were used to study many of these complexes in the solution state, whilst microanalysis, 31P CP MAS NMR and single crystal X-ray diffraction studies were used to study their solid state properties. The complexes of the type bis(2-halophenyl)diphenylphosphine copper halide were found to be three coordinate with non-chelating ligands and to be isostructural with the previously studied bis(2-methylphenyl)diphenylphosphine copper halide complexes. The synthesis and characterization of ruthenium(II) based complexes incorporating hemilabile phosphine ligands involved reaction of the appropriate ligands in MeOH with RuCl3.3H2O or RuCl2(DMSO)4 as the ruthenium source. Modes of characterization included solution state 31P NMR, mass spectrometry, microanalysis and single crystal X-ray diffraction studies. All ruthenium(II) based complexes were found to incorporate the hemilabile ligands in a chelating mode resulting in 6 coordinate structures. The preliminary polymerization testing of MMA in the presence of the copper(I) and ruthenium(II) based complexes has been reported. All complexes successfully polymerized the monomer and the resulting polyMMA showed polydispersity values ranging from moderate (3.1) to very high (6.7). Chapter 7 discusses research conducted over a 6 month period at the University of Calgary, Canada under an International Resident Fellowship award. This work involved the synthesis and characterization of scandium(III) and yttrium(III) based complexes incorporating a chelating amido-imine ligand, as potential olefin polymerization catalysts.
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2

Noack, Cassandra. "Studies in Coordination Chemistry." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/366798.

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The research reported in this thesis was carried out in Brisbane, Australia and Calgary, Canada. The aim of the research conducted in Brisbane was to prepare a series of copper(I) and ruthenium(II) based complexes incorporating a hemilabile phosphine ligand and to determine whether or not these compounds possessed catalytic activity. The history, uses, properties and recent work incorporating hemilabile phosphine ligands is discussed in detail as well as the application of hemilabile ligands to atom transfer radical polymerization (ATRP) and the usefulness of the 'windscreen wiper' action of these ligands in polymerization. The literature synthesis and characterization of four hemilabile phosphine ligands is reported with modifications. The (2-chlorophenyl)diphenylphosphine ligand was prepared via a Grignard reaction giving a 11% yield. The (2-bromophenyl) diphenylphosphine ligand was prepared by reaction of 2-bromoiodobenzene with Ph2PSiMe3 in the presence of a palladium catalyst (MeCN)2PdCl2 which yielded 50% product. The 1-chloro-2-diphenylphosphinoethane ligand was prepared following the generation of a lithium diphenylphosphide which was added to 1,2-dichloroethane to give a 43% yield of product. The (2-benzoic-acid)diphenylphosphine ligand was prepared by hydrolysis of (2-methyl-ester-phenyl)diphenylphosphine. Following acidification of the methyl ester phosphine with HCl, the desired product was isolated in 88% yield. The synthesis and characterization of a series of copper(I) based complexes incorporating the prepared phosphine ligands involved reaction in CH3CN of the appropriate ligand with copper halides as starting material. Solution state 31P NMR and mass spectrometry were used to study many of these complexes in the solution state, whilst microanalysis, 31P CP MAS NMR and single crystal X-ray diffraction studies were used to study their solid state properties. The complexes of the type bis(2-halophenyl)diphenylphosphine copper halide were found to be three coordinate with non-chelating ligands and to be isostructural with the previously studied bis(2-methylphenyl)diphenylphosphine copper halide complexes. The synthesis and characterization of ruthenium(II) based complexes incorporating hemilabile phosphine ligands involved reaction of the appropriate ligands in MeOH with RuCl3.3H2O or RuCl2(DMSO)4 as the ruthenium source. Modes of characterization included solution state 31P NMR, mass spectrometry, microanalysis and single crystal X-ray diffraction studies. All ruthenium(II) based complexes were found to incorporate the hemilabile ligands in a chelating mode resulting in 6 coordinate structures. The preliminary polymerization testing of MMA in the presence of the copper(I) and ruthenium(II) based complexes has been reported. All complexes successfully polymerized the monomer and the resulting polyMMA showed polydispersity values ranging from moderate (3.1) to very high (6.7). Chapter 7 discusses research conducted over a 6 month period at the University of Calgary, Canada under an International Resident Fellowship award. This work involved the synthesis and characterization of scandium(III) and yttrium(III) based complexes incorporating a chelating amido-imine ligand, as potential olefin polymerization catalysts.
Thesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Science
Faculty of Science
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3

Thorne, Lisa Margaret. "Sensing of carbon monoxide via luminescence of ruthenium complexes containing a hemilabile phosphine pyrenyl ether ligand." Thesis, 2004. http://hdl.handle.net/2429/15717.

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Our laboratory previously reported a Ru2 + complex with a hemilabile phosphine ether ligand tcc-RuCl2(POC4Pyr-P,O)2 (14) (POC4Pyr = 4-{2- (diphenylphosphino)phenoxy}butylpyrene). This complex reacts rapidly with carbon monoxide to produce a significant luminescence response in which the monomer: excimer emission ratio changes dramatically. The reaction with CO is accompanied by a geometric isomerization from the initial trans-dicarbonyl product, ttt- RuCl2(CO)2(POC4Pyr-P)2 , to the cis-dicarbonyl product, crt-RuCl2(CO)2(POC4Pyr-P)2. However, an OFF-ON response was not achieved. Two methodologies are explored in this thesis to obtain the desirable OFF-ON response by promoting pyrene fluorescence quenching before exposure to CO. Attempts are reported to synthesize ligands with tether lengths less than four carbon atoms in length in order to probe the effect of tether length between the pyrene moiety and the rest of the complex on fluorescence quenching. Although a ligand with a one-carbon tether ({2-(diphenylphosphino)phenoxy}methylpyrene) was not successfully synthesized, a ligand with a two-carbon tether (2-{2- (diphenylphosphino)phenoxy}ethylpyrene) was obtained. However, attempts to coordinate this ligand with Ru were unsuccessful. A second strategy explored in this thesis is the effect of changing the halide ligands of complex 14 to either bromo (22) (tcc-RuBr2(POC4Pyr-P,O)2) or iodo ligands (23) (tcc-Rul2(POC4Pyr-P,O)2). The different halogen ligands are expected to change the energies of the metal d-orbitals and possibly result in fluorescence quenching. This series of complexes with different halogen ligands has been fully characterized by NMR, MS, UV-vis and fluorescence spectroscopies and their reactivity toward CO studied. A similar geometric isomerization from the ttt isomer to the cct isomer was observed for 22 and 23 as for 14. Furthermore, fluorescence experiments were undertaken in order to explore the changes in fluorescence properties that accompany the reaction with CO. No excimer emission is observed even at high concentration before reaction with CO for 14, 22 or 23. After reaction with CO, excimer emission is observed for all complexes. From excitation, steady-state emission, and UV-vis spectroscopies, it has been determined that both inter- and intra-molecular excimers are observed that originate from loosely coupled or transient molecular pairs.
Science, Faculty of
Chemistry, Department of
Graduate
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Conference papers on the topic "Hemilabile phosphine ligands"

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Marra, Roberta K. F., Alice M. R. Bernardino, Marcos C. de Souza, Gilberto A. Romeiro, María J. Iglesias, and Fernando López-Ortiz. "Synthesis of new hemilabile ligands based on phosphinic amide and pyrazolo[1,5-c]quanazoline moieties Applications in coordination chemistry." In 15th Brazilian Meeting on Organic Synthesis. São Paulo: Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_201381913053.

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