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Relevant bibliographies by topics / Rhenium compounds – Oxidation

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Academic literature on the topic 'Rhenium compounds – Oxidation'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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Journal articles on the topic "Rhenium compounds – Oxidation"

1

Ionov, A. M., M. R. Kobrin, R. N. Mozhchil, A. S. Sigov, Yu V. Syrov, and V. V. Fomichev. "SYNTHESIS AND STUDY OF RHENIUM(IV) DISULPHIDE." Fine Chemical Technologies 12, no. 6 (December 28, 2017): 83–90. http://dx.doi.org/10.32362/2410-6593-2017-12-6-83-90.

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Synthesis and study of complex chalcogenides in the low oxidation state opens unexpected new opportunities of studying some fundamental problems of condensed matter physics. Dichalcogenides of transition metals, i.e., compounds with the general formula MX2, where M is molybdenum, tungsten, rhenium etc., and X is sulphur, selenium or tellurium, are especially interesting. These dichalcogenides find applications in optoelectronic devices, radiophotonics, in laser physics, communication technology, etc. This study contains a survey of literature concerning the synthesis of sulphides of transition elements from different groups of the Periodic table in low oxidation states. A method of direct hightemperature synthesis of ReS2 from source components has been proposed and implemented. The synthesized compound was identified by the X-ray fluorescence, method of photoelectron spectroscopy and IR absorption spectroscopy. We show that rhenium(IV) disulphide crystallizes in CdI2 structural type. X-ray photoelectron spectroscopy shows that rhenium in the oxidation state of four is present. IR spectrum shows that rhenium(IV) disulphide structure in contrast to molybdenum(IV) disulphide is characterized by a greater deformation of the layers forming the crystal structure.

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2

Leszczyńska-Sejda, Katarzyna, Grzegorz Benke, Joanna Malarz, Mateusz Ciszewski, Dorota Kopyto, Jędrzej Piątek, Michał Drzazga, Patrycja Kowalik, Krzysztof Zemlak, and Bartłomiej Kula. "Rhenium(VII) Compounds as Inorganic Precursors for the Synthesis of Organic Reaction Catalysts." Molecules 24, no. 8 (April 12, 2019): 1451. http://dx.doi.org/10.3390/molecules24081451.

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Rhenium is an element that exhibits a broad range of oxidation states. Synthesis paths of selected rhenium compounds in its seventh oxidation state, which are common precursors for organic reaction catalysts, were presented in this paper. Production technologies for copper perrhenate, aluminum perrhenate as well as the ammonia complex of cobalt perrhenate, are thoroughly described. An ion exchange method, based on Al or Cu metal ion sorption and subsequent elution by aqueous perrhenic acid solutions, was used to obtain perrhenates. The produced solutions were neutralized to afford the targeted aluminum perrhenate and copper perrhenate products in high purity. The developed technologies allow one to manage the wastes from the production of these perrhenates as most streams were recycled. Hexaamminecobalt(III) perrhenate was produced by a newly developed method enabling us to produce a high purity compound in a reaction of spent hexaamminecobalt(III) chloride solution with a perrhenic acid. All prepared compounds are the basis for precursor preparation in organic catalysis.

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Collery, Philippe, Didier Desmaele, and Veena Vijaykumar. "Design of Rhenium Compounds in Targeted Anticancer Therapeutics." Current Pharmaceutical Design 25, no. 31 (November 14, 2019): 3306–22. http://dx.doi.org/10.2174/1381612825666190902161400.

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Background: Many rhenium (Re) complexes with potential anticancer properties have been synthesized in the recent years with the aim to overcome the clinical limitations of platinum agents. Re(I) tricarbonyl complexes are the most common but Re compounds with higher oxidation states have also been investigated, as well as hetero-metallic complexes and Re-loaded self-assembling devices. Many of these compounds display promising cytotoxic and phototoxic properties against malignant cells but all Re compounds are still at the stage of preclinical studies. Methods: The present review focused on the rhenium based cancer drugs that were in preclinical and clinical trials were examined critically. The detailed targeted interactions and experimental evidences of Re compounds reported by the patentable and non-patentable research findings used to write this review. Results: In the present review, we described the most recent and promising rhenium compounds focusing on their potential mechanism of action including, phototoxicity, DNA binding, mitochondrial effects, oxidative stress regulation or enzyme inhibition. Many ligands have been described that modulating the lipophilicity, the luminescent properties, the cellular uptake, the biodistribution, and the cytotoxicity, the pharmacological and toxicological profile. Conclusion: Re-based anticancer drugs can also be used in targeted therapies by coupling to a variety of biologically relevant targeting molecules. On the other hand, combination with conventional cytotoxic molecules, such as doxorubicin, allowed to take into profit the targeting properties of Re for example toward mitochondria. Through the example of the diseleno-Re complex, we showed that the main target could be the oxidative status, with a down-stream regulation of signaling pathways, and further on selective cell death of cancer cells versus normal cells.

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Herrmann, Wolfgang A., Josef K. Felixberger, Josef G. Kuchler, and Eberhardt Herdtweck. "Alkin-Komplexe des Rheniums in hohen Oxidationsstufen / Alkyne Complexes of Rhenium in High Oxidation States." Zeitschrift für Naturforschung B 45, no. 6 (June 1, 1990): 876–86. http://dx.doi.org/10.1515/znb-1990-0620.

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The class of π-alkyne complexes of metals in medium and high oxidation states has been extended by the type CH3ReO2(RC≡CR′) (3a—i). Exchange of alkyne for oxo ligands under reducing conditions has been employed as a new general synthesis. Compounds 3 are thus obtained by reaction of methyltrioxorhenium(VII) (1) with the alkynes 2a—i in the presence of a ca. 1.1-fold molar amount of polymer-bound triphenylphosphane as reducing agent (desoxygenation). The structural characterization was carried out for the example of the tolan complex 3 e by virtue of a single-crystal X-ray diffraction study at —80 °C, according to which the description of compounds 3 as “rhenacyclopropenes” seems justified. Evidence from NMR investigations of 3 a and 3 c shows that no fast rotation of the respective alkyne ligand around the axis to the metal atom occurs on the NMR time scale up to at least 105 °C. A minimal rotation barrier of approximately 20 kcal/mol is thus to be estimated. Reaction of type 3 compounds (R = R′ = CH3, b; R = R′ = C2H5, c) with polymer-bound triphenylphosphane under more drastic conditions (boiling toluene) for two days effects further reduction, with the dinuclear, diamagnetic rhenium(IV) complexes 4b and 4c, resp., being formed. Sterically demanding alkynes (e.g., R = R′ = Si(CH3)3, C6H5) seem to prevent this type of reaction. According to an X-ray diffraction study, 4b has an equilateral Re2O-triangular core geometry, with the ligands O, CH3, and butyne(2) arranged in such a way that C2-symmetry results. The alkyne complexes reported here are the first ones of tetra- and pentavalent rhenium.

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Lupacchini, Massimiliano, Andrea Mascitti, Valentino Canale, Lucia Tonucci, Evelina Colacino, Maurizio Passacantando, Alessandro Marrone, and Nicola d'Alessandro. "Deoxydehydration of glycerol in presence of rhenium compounds: reactivity and mechanistic aspects." Catalysis Science & Technology 9, no. 12 (2019): 3036–46. http://dx.doi.org/10.1039/c8cy02478b.

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6

Savoie, Carole, and Christian Reber. "Near-infrared and visible luminescence and absorption spectroscopy of low-coordinate organometallic rhenium compounds." Canadian Journal of Chemistry 74, no. 1 (January 1, 1996): 28–31. http://dx.doi.org/10.1139/v96-003.

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Low-temperature absorption and luminescence spectra of four organorhenium compounds were measured in the visible and near-infrared spectral regions. Effects of the temperature, formal oxidation state, and the oxo-, bromo-, and organic ligands on the metal center are reported. The emission maxima of the four compounds show a large variation between 9000 and 14 200 cm−1. Stokes shifts show a smaller variation from 3700 to 4200 cm−1. Luminescence intensities are used to qualitatively characterize nonradiative relaxation processes. Key words: luminescence spectra, absorption spectra, organorhenium compounds.

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Carvalho, M. Fernanda N. N., Armando J. L. Pombeiro, Gabriele Wagner, Bjørn Pedersen, and Rudolf Herrmann. "Cascade Reaction of Camphor-Derived Diynes with Transition Metal Compounds." Zeitschrift für Naturforschung B 54, no. 6 (June 1, 1999): 725–33. http://dx.doi.org/10.1515/znb-1999-0604.

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Platinum(II) catalyzes the isomerization of camphor sulfonamide diynes in a cascade reaction involving annulation of a five-membered ring to the camphor skeleton, ring-enlargement by C-C bond cleavage, reduction of sulfur(VI) to sulfur(IV), and oxidation of a hydroxy group to a ketone. The reactions of the diynes with other transition metal compounds were also studied. Copper, gold and rhenium give final products similar to those obtained with simple Brønsted acids or halogens, mainly by annulation o f a five-membered ring to the camphor moiety, accompanied by reduction of a sulfonamide to a sulfinamide group, but lacking the ring-enlargement step. Palladium(II) occupies an intermediate position as both types o f products are obtained. The reaction mechanism and intermediates are discussed

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Vogler, Arnd, and Horst Kunkely. "Excited state properties of organometallic compounds of rhenium in high and low oxidation states." Coordination Chemistry Reviews 200-202 (May 2000): 991–1008. http://dx.doi.org/10.1016/s0010-8545(99)00241-6.

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9

Murillo, Carlos A. "A Magic Equation: Delta Bonds Plus Bicyclic Guanidinates Equals Strong Reducing Agents." Australian Journal of Chemistry 67, no. 7 (2014): 972. http://dx.doi.org/10.1071/ch13694.

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Reactions of bicyclic guanidinates with dimolybdenum and ditungsten precursors having quadruple bonded units with a σ2π4δ2 (Q) electronic configuration have generated the most easily ionized, chemically stable species and very strong reducing agents. Analogous rhenium compounds have led to the formation of species having dimetal units in unusually high oxidation states. Here we review this chemistry and the accounts that explain such behaviour that has been attributed to the interaction of the π electrons of the guanidinate C(N)3 core with the electrons that give rise to the delta bond of the dimetal units.

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10

Crestini, Claudia, Maria Chiara Caponi, Dimitris S. Argyropoulos, and Raffaele Saladino. "Immobilized methyltrioxo rhenium (MTO)/H2O2 systems for the oxidation of lignin and lignin model compounds." Bioorganic & Medicinal Chemistry 14, no. 15 (August 2006): 5292–302. http://dx.doi.org/10.1016/j.bmc.2006.03.046.

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Dissertations / Theses on the topic "Rhenium compounds – Oxidation"

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Smithback, Joanna L. "Design of monomeric and oligomeric rhenium(II/I) redox systems based on diimine and diphosphine ligands." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1212790621&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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2

DuMez, Darin David. "Synthesis and selective oxidations of rhenium hydrotris(1-pyrazolyl) borate compounds /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/8674.

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Legoupy, Stéphanie. "Synthèse et réactivité de nouveaux complexes organométalliques chiraux du rhénium." Rennes 1, 1997. http://www.theses.fr/1997REN10148.

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Le travail présenté dans ce mémoire concerne la synthèse et la réactivité de complexes du rhénium. De nouveaux complexes organométalliques chiraux du rhénium des alcools propargyliques et homoallylique ont été synthétisés. Des alcools allyliques secondaires et 1,2-disubstitues ont été coordonnés à l'entité chirale (#5C#5H#5)Re(No)(Pph#3)#+Bf#4#-. Dans le cas du 3-buten-2-ol complexe, les deux diastéréoisomères ont pu été séparés. L'étude de la réactivité de ces complexes du rhénium a montré qu'ils sont compatibles avec des réactions d'oxydation, de Wittig, de réduction, d'estérification, de chloration, de bromation et de fluoration. L'entité organométallique (#5C#5H#5)Re(No)(Pph#3)#+Bf#4#- s'est montrée un bon groupement protecteur d'une seule double liaison au cours de ces réactions. Les substitutions allyliques, catalysées par un acide de Lewis, sur les complexes du rhénium des alcools allyiques ont été étudiées. Quelque soit le nucléophile, ces réactions sont régio- et stéréosélectives et se font avec rétention de configuration. Un mécanisme impliquant un complexe -allyl dicationique du rhénium a été proposé. Le rôle activateur du rhénium a été mis en évidence.

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4

鄭嘉慧 and Kar-wai Anita Cheng. "Preparation, reactivities and oxidative catalytic activities of ruthenium(II) polypyridines, rhenium(I) carbonyl complexes andruthenium-encapsulated meso- and micro-porous molecular sieves." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31236662.

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Cheng, Kar-wai Anita. "Preparation, reactivities and oxidative catalytic activities of ruthenium(II) polypyridines, rhenium(I) carbonyl complexes and ruthenium-encapsulated meso- and micro-porous molecular sieves /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1973816X.

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Ness, Stephanie L. "Evidence for a stepwise mechanism in the cycloreversion of rhenium diolates." Thesis, 1999. http://hdl.handle.net/1957/33581.

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7

Brown, Eric C. "Rhenium-catalyzed oxygen-atom transfer reactions : mechanism and applications." Thesis, 2002. http://hdl.handle.net/1957/31653.

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In situ reduction of hydrido-tris-(3,5-dimethylpyrazolyl)borato(trioxo) rhenium(V) with triphenylphosphine or triethylphosphite leads to a reactive rhenium(V) species that catalytically deoxygenates epoxides at 75-105��C. The reaction is stereospecific, except for trans- and cis-butene oxide which formed minor amounts of the opposite isomer. A variety of different functional groups were tolerated and even epoxides that reacted slowly could be pushed to greater than 95% conversion given extended time and/or higher temperature. The absence of clustering processes shows how the choice of ligand can have a major influence on the design of the catalytic cycle. The rhenium(V) species formed from reduction of Tp'ReO�� was identified as Tp'Re(O)(OH)��. Tp'Re(O)(OH)�� reacted with ethanol and HCl to form ethoxide and hydroxo chloride complexes, respectively. In addition, Tp'Re(O)(OH)�� was an excellent catalytic and stoichiometric reagent for the deoxygenation of epoxides and sulfoxides. Loss of water from Tp'Re(O)(OH)�� to form the catalytically active species Tp'Re02 was shown to be a necessary preequilibrium process. The kinetic behavior of the catalytic system is complex. First-order behavior in [Re][subscript T], zero-order dependence in [PPh��] and saturation behavior for epoxide were observed. The reversible formation of a coordinated epoxide complex was proposed to explain the saturation behavior. The epoxide complex was shown experimentally and computationally to engage in two separate reactions: ring expansion to form a syn-diolate complex, and direct fragmentation to alkene and trioxide. A steady-state concentration of diolate is eventually reached explaining a "burst" of alkene production prior to generation of a pseudo-zero-order catalytic system. The diolate formed is the syn-isomer, which is the kinetically formed product. Direct epoxide fragmentation is the primary source of alkene. This process was determined to be four times faster than ring expansion for cis-stilbene oxide. The synthesis and characterization of a tethered-epoxide Cp* rhenium trioxide complex has been achieved. Reduction of this complex leads to an unsaturated rhenium(V) species that is immediately complexed by the tethered epoxide. Experimental data and molecular mechanics modeling support intramolecular coordination of the epoxide to the rhenium center. These results confirm that the coordinate epoxide is a viable intermediate in rhenium-catalyzed epoxide deoxygenations.
Graduation date: 2003

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Khownium, Kriangsak. "Direct atom transfer vs. ring expansion in reaction of rhenium oxo complexes with cyclooctene epoxides and episulfides." Thesis, 2003. http://hdl.handle.net/1957/29849.

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Books on the topic "Rhenium compounds – Oxidation"

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Ness, Stephanie L. Evidence for a stepwise mechanism in the cycloreversion of rhenium diolates. 1999.

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Book chapters on the topic "Rhenium compounds – Oxidation"

1

Kühn, F. E., C. C. Romäo, and W. A. Herrmann. "Synthesis from Low-Oxidation-State Rhenium Precursors." In Compounds of Groups 7-3 (Mn..., Cr..., V..., Ti..., Sc..., La..., Ac...), 1. Georg Thieme Verlag KG, 2003. http://dx.doi.org/10.1055/sos-sd-002-00160.

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Kühn, F. E., C. C. Romäo, and W. A. Herrmann. "Carbonyl(halo)rhenium Complexes Prepared by Oxidative Addition." In Compounds of Groups 7-3 (Mn..., Cr..., V..., Ti..., Sc..., La..., Ac...), 1. Georg Thieme Verlag KG, 2003. http://dx.doi.org/10.1055/sos-sd-002-00212.

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