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Relevant bibliographies by topics / Osmium compounds - Oxidation

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Academic literature on the topic 'Osmium compounds - Oxidation'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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Journal articles on the topic "Osmium compounds - Oxidation"

1

Shul’pin, Georgiy B., Aleksandr R. Kudinov, Lidia S. Shul’pina, and Elena A. Petrovskaya. "Oxidations catalyzed by osmium compounds. Part 1: Efficient alkane oxidation with peroxides catalyzed by an olefin carbonyl osmium(0) complex." Journal of Organometallic Chemistry 691, no. 5 (2006): 837–45. http://dx.doi.org/10.1016/j.jorganchem.2005.10.028.

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Crochet, Pascale, and Victorio Cadierno. "Arene-Osmium(II) Complexes in Homogeneous Catalysis." Inorganics 9, no. 7 (2021): 55. http://dx.doi.org/10.3390/inorganics9070055.

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Although the application of arene-osmium(II) complexes in homogeneous catalysis has been much less studied than that of their ruthenium analogues, different works have shown that, in some instances, a comparable or even superior effectiveness can be achieved with this particular class of compounds. This review article focuses on the catalytic applications of arene-osmium(II) complexes. Among others, transfer hydrogenation, hydrogenation, oxidation, and nitrile hydration reactions, as well as different C-C bond forming processes, are comprehensively discussed.

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Shul’pin, Georgiy B., and Lidia S. Shul’pina. "Oxidation of Organic Compounds with Peroxides Catalyzed by Polynuclear Metal Compounds." Catalysts 11, no. 2 (2021): 186. http://dx.doi.org/10.3390/catal11020186.

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The review describes articles that provide data on the synthesis and study of the properties of catalysts for the oxidation of alkanes, olefins, and alcohols. These catalysts are polynuclear complexes of iron, copper, osmium, nickel, manganese, cobalt, vanadium. Such complexes for example are: [Fe2(HPTB)(m-OH)(NO3)2](NO3)2·CH3OH·2H2O, where HPTB-¼N,N,N0,N0-tetrakis(2-benzimidazolylmethyl)-2-hydroxo-1,3-diaminopropane; complex [(PhSiO1,5)6]2[CuO]4[NaO0.5]4[dppmO2]2, where dppm-1,1-bis(diphenylphosphino)methane; (2,3-η-1,4-diphenylbut-2-en-1,4-dione)undecacarbonyl triangulotriosmium; phenylsilsesquioxane [(PhSiO1.5)10(CoO)5(NaOH)]; bi- and tri-nuclear oxidovanadium(V) complexes [{VO(OEt)(EtOH)}2(L2)] and [{VO(OMe)(H2O)}3(L3)]·2H2O (L2 = bis(2-hydroxybenzylidene)terephthalohydrazide and L3 = tris(2-hydroxybenzylidene)benzene-1,3,5-tricarbohydrazide); [Mn2L2O3][PF6]2 (L = 1,4,7-trimethyl-1,4,7-triazacyclononane). For comparison, articles are introduced describing catalysts for the oxidation of alkanes and alcohols with peroxides, which are simple metal salts or mononuclear metal complexes. In many cases, polynuclear complexes exhibit higher activity compared to mononuclear complexes and exhibit increased regioselectivity, for example, in the oxidation of linear alkanes. The review contains a description of some of the mechanisms of catalytic reactions. Additionally presented are articles comparing the rates of oxidation of solvents and substrates under oxidizing conditions for various catalyst structures, which allows researchers to conclude about the nature of the oxidizing species. This review is focused on recent works, as well as review articles and own original studies of the authors.

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4

Lau, Man-Kit, Joyce LC Chim, Wing-Tak Wong, Ian D. Williams, and Wa-Hung Leung. "Synthesis and molecular structures of monooxo aryl complexes of osmium(VI)." Canadian Journal of Chemistry 79, no. 5-6 (2001): 607–12. http://dx.doi.org/10.1139/v00-192.

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Reaction of [OsO4] with C7H7MgBr (C7H7 = 2-methylphenyl) followed by column chromatography afforded the reported osmium tetraaryl [Os(C7H7)4] along with the oxo-osmium(VI) ([OsO(C7H7)4]) (1) (13%) and the dioxo-osmium(VI) ([OsO2(C7H7)2]) (2) (25%) complexes. Treatment of [OsO4] with C8H9MgBr (C8H9 = 2,5-dimethylphenyl) gave a mixture of [Os(C8H9)4] (3) (34%) and [OsO(C8H9)4] (4) (4%) while that with C8H9OMgBr (C8H9O = 4-methoxy-2-methylphenyl) afforded [OsO(C8H9O)4] (5) in 20% yield. Oxidation of 3 with 3-chloroperoxybenzoic acid afforded 4 in good yield. The solid-state structures of 1 and 4 have been established by X-ray crystallography. Crystals of 1 are tetragonal with a = 13.080(1) and c = 6.6506(5) Å, V = 1137.9(1) Å3, Z = 2, and space group of P4/n; while those of 4 are tetragonal with a = 13.593(2) and c = 7.377(2) Å, V = 1363.0(5) Å3, Z = 4, and space group of P4/n. The geometry around osmium in both complexes is square pyramidal with the oxo ligand occupying apical position. The OsO and OsC distances in 1 are 1.652(2) and 2.084(1) Å, respectively, while those in 4 are 1.688(7) and 2.088(4) Å, respectively. The cyclic voltammograms of the monooxo aryl osmium(VI) compounds show reversible Os(VI/V) couple at around 1.4 V vs. ferrocene/ferrocenium couple.Key words: osmium(VI), oxo aryl complexes.

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5

Ivon, Ye, V. Le, and Z. Voitenko. "SYNTHESIS OF PHENYLACETYL MIDA BORONATES BY OXIDATIVE CLEAVAGE OF VICINAL DIOLS." Bulletin of Taras Shevchenko National University of Kyiv. Chemistry, no. 1(55) (2018): 50–54. http://dx.doi.org/10.17721/1728-2209.2018.1(55).12.

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A synthetical approach to acyl(N-methyliminodiacetyl)boronates starting from 1-substituted alkenylboronates has been developed. A comparison of different methods of oxidative cleavage of an α-borylated C-C bound was made. It was found, that the best results can be obtained by sequential osmium tetroxide-catalyzed dihydroxylation of an alkene moiety followed by cleavage of the obtained vicinal diol. The cleavage procedure takes place at 0°C in homogeneous conditions (solution of periodic acid in THF) and it is complete in 10 minutes (more prolonged contact with an oxidant solution results in degradation of the target compound). On the other hand, using of ruthenium tetroxide-based reagents results in overoxidation with simultaneous loss of boron moiety. Potassium permanganate protocols leads to the α-borylated-α-hydroxyketone, which is prone to further oxidation. Although 1-alkyl-vinylboronates react smoothly with 3-chloroperbenzoic acid to give corresponding oxiranes (without cleavage of C-B bound), the latter ones are stable toward action of sodium meta-periodate or periodic acid. The results were shown on the model compound – phenylacetyl MIDA boronate. Precursor of this compound, namely, Z-2-(N-methyliminodiacetylboryl)-1-phenylbut-2-ene was prepared in four steps, starting from common-use reagents with 32% overall yield. Thus the new approach allows acetyl MIDA boronates to be prepared just in 6 linear steps. It is remarkable, that mild and homogeneous conditions of the oxidation step permit to carry out this transformation on gram scale. A preliminary investigation of these substances stability towards common methods of working up and purification procedures was made. It was found, that phenylacetyl MIDA boronate and preceding diol, both are stable to storage at ambient conditions (tightly closed vessel, ambient temperature) at least for one month, showing no changes in its NMR spectra. Also, these compounds are stable to extractive work up with NaHCO3, Na2S2O3 and diluted acids. Stability toward chromatography on silica, prolonged contact with water or alcohols is limited. Structures and purity of compounds in this work was established by 1H, 13C – NMR and HPLC-analyses.

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Rukk, N. S., R. M. Zakalyukin, and A. Yu Skryabina. "LANTHANIDE OXYIODIDES." Fine Chemical Technologies 11, no. 1 (2016): 5–22. http://dx.doi.org/10.32362/2410-6593-2016-11-1-5-22.

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The present review is devoted to consideration and generalization of a number of synthetic methods for lanthanide oxoiodides preparation as well as to consideration of their structural particularities and thermal stability. Phase diagrams with the participation of REE oxoiodides, alkaline metal iodides or silver iodide are given and discussed. All the systems are characterized by the solid solution formation on the basis of the pure compounds, while the systems with the participation of alkaline metal iodides are characterized by the formation of incongruent melting compounds. Structural data concerning oxoiodides of lanthanides with different oxidation states and with the participation of some other elements (carbon, nitrogen, barium, osmium, etc) are present and overviewed. Possible areas of application (catalysis, X-ray detectors, medical diagnostics) including distinct luminescent properties of Ce-, Pr-, Nd-, Sm-doped REE oxoiodides are underlined.

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Shul'pin, Georgiy B., Yuriy N. Kozlov, Lidia S. Shul'pina, Wagner A. Carvalho, and Dalmo Mandelli. "Oxidation reactions catalyzed by osmium compounds. Part 4. Highly efficient oxidation of hydrocarbons and alcohols including glycerol by the H2O2/Os3(CO)12/pyridine reagent." RSC Advances 3, no. 35 (2013): 15065. http://dx.doi.org/10.1039/c3ra41997e.

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8

SINGH, SANTOSH BAHADUR. "IRIDIUM CHEMISTRY AND ITS CATALYTIC APPLICATIONS: A BRIEF." Green Chemistry & Technology Letters 2, no. 4 (2016): 206. http://dx.doi.org/10.18510/gctl.2016.247.

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Iridium is very important element among the all transition metals with highest reported oxidation state i.e. +9 in gas phase existing species IrO4+. Instead of its less reactivity, it forms number of compounds having oxidation states between -3 to +9. It is second known densest element after osmium. Till now its toxicity and environmental impact is not much more reported and thus it may be use as green element in various fields of its application. Reason behinds it’s less toxicity and environmental impact may be due to its less reactivity and solubility. Corrosion and heat resistant properties of Iridium makes it much more useful element for alloying purpose. Iridium is the member of platinum family and used as catalyst due to its variable oxidation states. Iridium(III) complexes show great catalytic activity in both the acidic and basic medium for various organic as well as inorganic chemical transformations. Catalyst may be defined as the substance which can increases the rate of reaction of a specific chemical reaction without changing its own composition. Iridium is only one reported catalyst which is able to capture the sunlight and convert it into the chemical energy. Thus, it may be used in artificial photosynthesis process to solve our future food problem. Instead of these advantage, Iridium chemistry and its catalytic activity is not much reviewed till date, therefore, present review includes a brief introduction about chemistry and catalytic application of Iridium, which proof itself a boon for beginners to start their research career in the field of Iridium chemistry.

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9

Cerón-Camacho, Ricardo, Manuel A. Roque-Ramires, Alexander D. Ryabov, and Ronan Le Lagadec. "Cyclometalated Osmium Compounds and beyond: Synthesis, Properties, Applications." Molecules 26, no. 6 (2021): 1563. http://dx.doi.org/10.3390/molecules26061563.

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The synthesis of cyclometalated osmium complexes is usually more complicated than of other transition metals such as Ni, Pd, Pt, Rh, where cyclometalation reactions readily occur via direct activation of C–H bonds. It differs also from their ruthenium analogs. Cyclometalation for osmium usually occurs under more severe conditions, in polar solvents, using specific precursors, stronger acids, or bases. Such requirements expand reaction mechanisms to electrophilic activation, transmetalation, and oxidative addition, often involving C–H bond activations. Osmacycles exhibit specific applications in homogeneous catalysis, photophysics, bioelectrocatalysis and are studied as anticancer agents. This review describes major synthetic pathways to osmacycles and related compounds and discusses their practical applications.

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10

Sixta, Torsten, Wolfgang Kaim, and Wilhelm Preetz. "Characterization of the Inorganic/Organometallic Osmium(IV) Compound [Cp2 OsIVCl]2 [OsIVCl6] as Formed by the Reaction of OSCI3 with Pentamethylcyclopentadiene in Air." Zeitschrift für Naturforschung B 55, no. 3-4 (2000): 235–37. http://dx.doi.org/10.1515/znb-2000-3-401.

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Abstract Reaction of OsCl3, with pentamethylcyclopentadiene in ethanol in air yields the ionic osmium( IV) compound [Cp*2OsCl]2[OsCl6] which has been identified structurally and by vibrational spectroscopy. Under comparable conditions the RuCl3 homologue yields the ruthenium( III) compound [Cp*RuCl2]2, illustrating the more facile oxidation of the 5d element to the tetravalent state

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Dissertations / Theses on the topic "Osmium compounds - Oxidation"

1

Crevier, Thomas J. "Oxidation and reduction of small molecules by tungsten and osmium compounds /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/11581.

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2

余永耀 and Wing-yiu Yu. "Oxidation chemistry of cis-dioxoosmium (VI) and Ruthenium-Oxo complexes bearing a C2 symmetry chelating ligand." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31234008.

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3

Yu, Wing-yiu. "Oxidation chemistry of cis-dioxoosmium (VI) and Ruthenium-Oxo complexes bearing a C2 symmetry chelating ligand /." Hong Kong : University of Hong Kong, 1993. http://sunzi.lib.hku.hk/hkuto/record.jsp?B20667346.

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4

Harbron, S. K. "Studies in the high oxidation state coordination chemistry of osmium and iron." Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.234174.

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5

任詠華 and Wing-wah Vivian Yam. "High-valent ruthenium and osmium oxo complexes for homogeneous and photochemical oxidations of inorganic and organic substrates." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31231421.

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6

Johnson, Peter David. "The tethered aminohydroxylation of allylic carbamates." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:29c750cd-f9aa-4a1d-9e7f-548f29ae18de.

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The osmium-mediated aminohydroxylation reaction is a powerful oxidation that introduces a hydroxyl group and a protected amino group in a syn relationship across an olefinic double bond. This study concerns one approach to controlling the regioselectivity of this oxidation. Introduction I The mechanism, scope and limitations of the aminohydroxylation reaction are discussed, with particular attention to the asymmetric version, providing a background from which the newly developed methodology has emerged. Results and Discussion I Development of the reaction This section concerns the original attempts to perform the tethered aminohydroxylation reaction, and early process optimisation to maximise the yield of aminohydroxylated product produced. Scope of the reaction This section details the results of the TA reaction as applied to further allylic carbamates demonstrating the applicability of the reaction to other olefinic geometries. The diastereoselectivity of the reaction in cyclic and acyclic systems is reported, and a model to explain the observed results discussed. Also covered within are the syntheses of the various substrates and proof of the stereochemistry of the products. Mechanistic investigations Work involving attempts to isolate a catalytic intermediate from the reaction is described. A crystal structure of this intermediate is discussed. Introduction II The isolation and physiological properties of the antibiotic compound hygromycin A are described. Prior synthetic routes towards this compound are discussed. Results and Discussion II Three approaches towards the aminocyclitol unit of hygromycin A, employing the tethered aminohydroxylation reaction, are outlined. Two of these allow for potential future development and completion of the synthesis.

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7

Yam, Wing-wah Vivian. "High-valent ruthenium and osmium oxo complexes for homogeneous and photochemical oxidations of inorganic and organic substrates /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12361434.

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8

Dehestani, Ahmad. "Exploring reactivities of oxo and nitrido ligands on high valent osmium with electrophiles, nucleophiles, alkenes, hydrogen, and methane. /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/8626.

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9

Siriwardane, Upali. "Systematic syntheses of iron-triad (Fe,Ru,Os) tetranuclear clusters by redox condensation reactions of [Ru(3);CO(11)) and [Os(3);CO(11)] trinuclear carbonylates; co-crystallization of ruthenium-osmium clusters /." The Ohio State University, 1985. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487264603216477.

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Book chapters on the topic "Osmium compounds - Oxidation"

1

Singh, Hari Shankar. "Oxidations of Organic Compounds with Osmium Tetroxide." In Organic Syntheses by Oxidation with Metal Compounds. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2109-5_12.

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