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Littérature scientifique sur le sujet « Hydroboranes synthesis »

Auteur : Grafiati

Publié le 21 décembre 2024

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Articles de revues sur le sujet "Hydroboranes synthesis"

Price, Jeffrey S., Declan M. DeJordy, David J. H. Emslie et James F. Britten. « Reactions of [(dmpe)2MnH(C2H4)] : synthesis and characterization of manganese(i) borohydride and hydride complexes ». Dalton Transactions 49, n^o 29 (2020) : 9983–94. http://dx.doi.org/10.1039/d0dt01726d.

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Reactions of trans-[(dmpe)₂MnH(C₂H₄)] with hydroboranes and phosphines afforded manganese(i) borohydride and hydride complexes; reaction pathways, structures and bonding are discussed.

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Kostera, Sylwia, Maurizio Peruzzini et Luca Gonsalvi. « Recent Advances in Metal Catalyst Design for CO2 Hydroboration to C1 Derivatives ». Catalysts 11, n^o 1 (2 janvier 2021) : 58. http://dx.doi.org/10.3390/catal11010058.

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The use of CO2 as a C1 building block for chemical synthesis is receiving growing attention, due to the potential of this simple molecule as an abundant and cheap renewable feedstock. Among the possible reductants used in the literature to bring about CO2 reduction to C1 derivatives, hydroboranes have found various applications, in the presence of suitable homogenous catalysts. The current minireview article summarizes the main results obtained since 2016 in the synthetic design of main group, first and second row transition metals for use as catalysts for CO2 hydroboration.

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Moroz, Antoni, et Ray L. Sweany. « Photolysis of argon matrixes containing tribromoboron and dihydrogen : synthesis of hydroboranes via dibromoboron ». Inorganic Chemistry 31, n^o 25 (décembre 1992) : 5236–42. http://dx.doi.org/10.1021/ic00051a015.

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MOROZ, A., et R. L. SWEANY. « ChemInform Abstract : Photolysis of Argon Matrices Containing Tribromoboron and Dihydrogen : Synthesis of Hydroboranes via Dibromoboron. » ChemInform 24, n^o 15 (20 août 2010) : no. http://dx.doi.org/10.1002/chin.199315025.

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Matsumi, Noriyoshi, Nobuaki Yoshioka et Keigo Aoi. « Synthesis of boric ester type ion-gels by dehydrocoupling of cellulose with hydroboranes in ionic liquid ». Solid State Ionics 226 (octobre 2012) : 37–40. http://dx.doi.org/10.1016/j.ssi.2012.07.018.

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., Eishika, Himani . et Ridhi . « Review of Synthesis and Characterization of Cu (I) Complexes ». International Journal of Research and Review 11, n^o 1 (10 janvier 2024) : 195–209. http://dx.doi.org/10.52403/ijrr.20240121.

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d-block metals show great promise in inorganic catalytic research. Particularly, copper, d9 metal has contributed to catalytic properties of its complexes. A series of copper complexes was synthesized and structurally characterized. The copper (I) complexes of this series were investigated in regard to their reactivity towards dioxygen using stopped-flow techniques. For most complexes no “oxygen adduct” complexes as intermediates could be detected. In this article, some complexes of Cu (I) have been included and the ligands on which work had been done are mentioned below: 1,5-bis(benzimidazole-2-yl)-3-thiapentane Tridentate di-pyrazole -3,6-di-tert-butyl-carbazole (N, N, N-Pincer ligand) Methyl isocyanate N4Cu Tris(pyrazolyl) hydroborate ligand Scorpionate ligand Phenanthroline Tripodal amine ligands Triazole derivatives Keywords: BBES (1,5-bis(benzimidazole-2-yl)-3-thiapentane), MeIN (Methyl isocyanate), CuSCN (copper thiocyanate), PPh3(triphenyl phosphine), PCy3(tricyclohexyl phosphine), TptBuPh (tris[3-(p-tert-butylphenyl)], Tp (tris pyrazolyl hydroborate), Me4-p,3,3 (3,3-dimethylaminopropyl-(2-methylenpyridyl)-amine), Me2-pp3 (3-dimethylaminopropyl-bis(2-methylenpyridyl)-amine)

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Bahsis, Lahoucine, Hicham Ben El Ayouchia, Hafid Anane, Carmen Ramirez de Arellano, Abdeslem Bentama, El El Hadrami, Miguel Julve, Luis Domingo et Salah-Eddine Stiriba. « Clicking Azides and Alkynes with Poly(pyrazolyl)borate-Copper(I) Catalysts : An Experimental and Computational Study ». Catalysts 9, n^o 8 (14 août 2019) : 687. http://dx.doi.org/10.3390/catal9080687.

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The synthesis of 1,4-disubstituted-1,2,3-triazoles under a copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) regime was accomplished in high yields and a regioselective manner by using two homoscorpionate poly(pyrazolyl)borate anions: tris(pyrazolyl)hydroborate (HB(pz)3−) and bis(pyrazolyl)hydroborate (H2B(pz)2−), which stabilized in situ the catalytically active copper (I) center. The [3+2] cycloaddition (32CA) reactions took place under strict click conditions, including room temperature and a mixture of environmentally benign solvents such as water/ethanol in a 1:1 (v/v) ratio. These click chemistry conditions were applied to form complex 1,2,3-triazoles-containing sugar moieties, which are potentially relevant from a biological point of view. Computational modeling carried out by DFT methodologies at the B3LYP/6-31G(d) level showed that the coordination of poly(pyrazolyl)borate-copper(I) to alkyne groups produced relevant changes in terms of generating a high polar copper(I)-acetylide intermediates. The analysis of the global and local reactivity indices explains correctly the role of poly(pyrazolyl)borate ligands in the stabilization and activation of the copper(I) catalyst in the studied 32CA reactions.

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Dunn, Simon C., Philip Mountford et Oleg V. Shishkin. « Imidotitanium Tris(pyrazolyl)hydroborates : Synthesis, Solution Dynamics, and Solid-State Structure ». Inorganic Chemistry 35, n^o 4 (janvier 1996) : 1006–12. http://dx.doi.org/10.1021/ic9510674.

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Bartholomew, Amymarie K., Louise M. Guard, Nilay Hazari et Eddie D. Luzik. « Synthesis of Mg Complexes Supported by Tris-(1-pyrazolyl)phosphine ». Australian Journal of Chemistry 66, n^o 11 (2013) : 1455. http://dx.doi.org/10.1071/ch13354.

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The preparation and characterisation of two Mg coordination compounds supported by the tris(1-pyrazolyl)phosphine (P(pz)3) ligand, [{P(pz)3}Mg(MeCN)3](I)2 and [Mg{P(pz)3}2](I)2, is described. This is the first time this ligand has been coordinated to Mg or any other s-block metal and the complexes are the first examples of crystallographically characterised P(pz)3 complexes on any metal. The structures of the new Mg complexes are compared with related species with the more common tridentate facial ligands, tris(pyrazolyl)hydroborate (Tp), tris(pyrazolyl)methane (Tpm), and tris(pyrazolyl)methanide (Tpmd).

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Dionne, Michel, Shoukang Hao et Sandro Gambarotta. « Preparation and characterization of a new series of Cr(II) hydroborates ». Canadian Journal of Chemistry 73, n^o 7 (1 juillet 1995) : 1126–34. http://dx.doi.org/10.1139/v95-139.

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The synthesis and characterization of a new series of mono-, di-, and trinuclear Cr(II) borohydride compounds is described. The reaction of CrCl2(TMEDA) with two equivalents of NaBH4 afforded the thermally unstable (TMEDA)Cr(BH4)2 (1), which was converted by treatment with pyridine into the octahedral monomeric (Py)4Cr(BH4)2 (2). The reaction proceeds via formation of an intermediate trinuclear complex {[(TMEDA)(Py)Cr(η2-BH4)]2[(Py)2Cr(η2-BH4)2]}(µ,η1-BH4)2 (3), which was isolated and characterized by X-ray crystallography. Reaction of 1 and 2 with both CO2 and RN=C=NR (R = Cy, iPr) afforded hydride insertion and formation of the corresponding diamagnetic lantern-type Cr(II) formate (HCO2)4Cr2Py2 (4) and formamidinate compounds [RNC(H)NR]2Cr2(µ-BH)4 (R = Cy (5a), iPr (5b)), respectively, with supershort Cr—Cr quadruple bonds. The structures of 1, 2, 3, and 5b were elucidated by X-ray analysis. Crystal data are as follows. 1: C6H24N2B2Cr, monoclinic, Cc, a = 8.517(2) Å, b = 15.921(5) Å, c = 9.624(2) Å, β = 115.59(1)°, Z = 4, R = 0.022, Rw = 0.029; 2: C28H44N4B2O2Cr, monoclinic, P21/n, a = 12.021(1) Å, b = 15.555(1) Å, c = 15.723(1) Å, β = 90.13(2)°, Z = 4, R = 0.074, Rw = 0.086; 3: C32H76N8B6Cr3, monoclinic, P21/n, a = 8.515(1) Å, b = 14.525(1) Å, c = 18.286(2) Å, β = 91.38(1)°, Z = 2, R = 0.051, Rw = 0.060; 5b: C21H49N6BCr2, monoclinic, C2/c, a = 17.000(1) Å, b = 9.033(1) Å, c = 19.160(1) Å, β = 105.579(9)°, Z = 4, R = 0.069, Rw = 0.078. Keywords: divalent chromium, borohydride, Cr—Cr quadruple bond.

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Thèses sur le sujet "Hydroboranes synthesis"

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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Chen, Heng-Guang, et 陳恒光. « Syntheses and Structures of Hydroborate Zirconium and Titanium Complexes ». Thesis, 2013. http://ndltd.ncl.edu.tw/handle/10140107312553336807.

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Panda, Monalisa [Verfasser]. « Synthesis and characterization of alkali metal borides and closo Hydroborates / vorgelegt von Monalisa Panda ». 2007. http://d-nb.info/983937869/34.

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Li, Kun-Yu, et 李坤育. « Synthesis and Reactivity Study of the Tris[3-2-pyridyl)pyrazolyl]hydroborate Iron Complexes ». Thesis, 2015. http://ndltd.ncl.edu.tw/handle/4ywxbq.

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碩士
高雄醫學大學
醫藥暨應用化學系碩士班
103
Trispyrazolylborate (Tp&;#8722;) type compound is a very important ligand set for small molecules activation the metalloenzyme mimicking system. Tris[3-(2-pyridyl)pyrazolyl]-hydroborate (Tp(py)&;#8722;) is a new type of Tp- ligand set which provides additional pyridine coordination site in 3-postion to explore some new coordination behavior for metal complexes. It is worth mentioning that there are no example of iron complexes containing Tp(py)&;#8722; ligand. Therefore, we focus on the synthesis and reactivity study of Tp(py)FeCl compound for the outer pyridine arm may mimic the amino acid residue around metalloenzyme active center. The Tp(py)FeCl complex represents as the first example of iron complex containing Tp(py)&;#8722; ligand and the dangling pyridine arm can be used to mimic the second sphere coordination environment of the iron containing enzyme active site. The coordinated chloride ligand were replaced by N3&;#8722; and CN&;#8722; in DMF solution to give Tp(py)FeN3 (1) and Tp(py)FeCN (2) respectively. The structure of complex 1 was characterized by X-ray crystallography showing a five-coordination Fe(II) center similar to that of Tp(py)FeCl. Complexes 1 and 2 were all examined by UV-vis and Infrared spectroscopies. Complex 2 also can be characterized by NMR spectroscopy to confirm the low spin electron configuration and diamagnetism.

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Kim, Do Young. « Synthesis of metal hydroborates as potential chemical vapor deposition precursors : chemical vapor deposition of titanium-doped magnesium diboride thin films / ». 2007. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3269943.

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Thesis (Ph. D.)--University of Illinois at Urbana-Champaign, 2007.
Source: Dissertation Abstracts International, Volume: 68-06, Section: B, page: 3782. Adviser: Gregory S. Girolami. Includes bibliographical references. Available on microfilm from Pro Quest Information and Learning.

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Chapitres de livres sur le sujet "Hydroboranes synthesis"

Klanberg, F., E. L. Muetterties, Alfred L. Moye et James C. Carter. « Polyhedral Hydroborates, Undecahydro-Undecaborate, Nonahydrononaborate, and Octahydrooctaborate ». Dans Inorganic Syntheses, 24–33. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132425.ch6.

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Brown, Charles Allan, Sheldon C. Shore et George Medford. « Potassium Tri(sec -Butyl)Hydroborate(1-) ». Dans Inorganic Syntheses, 26–30. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132487.ch7.

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« Comprehensive Survey of Combustion Agents ». Dans High-energy Combustion Agents of Organic Borohydrides, 1–35. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837670017-00001.

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This chapter presents a comprehensive survey of the most recent achievements on advanced combustion agents, including ionic hydroborate, carborane and its derivatives, metal carborane, and borane energetic ionic liquids (salts), and summarizes the synthesis progress of carborane derivatives, and the progress of application of carborane derivatives and hydroborate salts in propellants and explosives.

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Taber, Douglass F. « The Trauner Synthesis of (−)-Nitidasin ». Dans Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0101.

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The sesterterpene (−)–nitidasin 4 is a component of the Peruvian infusion “hercampuri,” prepared from the shrubs Gentianella nitida and Gentianella alborosea, that was used traditionally to treat hepatitis, diabetes, and hypertension. Dirk Trauner of Ludwig–Maximilians–Universität München envisioned (Angew. Chem. Int. Ed. 2014, 53, 8513) the assembly of 4 by the convergent coupling of 1 with 2 to give 3. For this strategy to be effective, both 1 and 2 had to be prepared in enantiomerically–enriched form. The skeleton of 1 was found in the enone 5, prepared by asymmetric Robinson annulation, that had already been carried on to the transfused ketone 6, and then to the enone 8 by way of 7. Following the authors earlier work (J. Org. Chem. 2012, 77, 5838), conjugate addition of 9 to the enone 8 gave 10. Hydrogenation of 10 had to be carried out with a Pt catalyst to avoid the undesired equilibration of the pendant group. Regioselectivity and diastereoselectivity in the hydroboration of the alkene 11 was optimized with the enantiomerically–pure borane. Allylation of the derived ketone was best effected by way of the enol borinate. Reduction of 12 with K–Selectride gave the cis alcohol, that was processed to the lactone. Kinetic alkylation then established the secondary methyl group. The lactone 13 was reduced to the diol, and protected as the bis TES ether. Selective oxidation of the primary TES ether generated the aldehyde, that could be methylenated without epimerization. Desilylation and oxidation then completed the synthesis of 1. The preparation of 2 began with commercial, enantiomerically–enriched citronellene 14. Oxidative cleavage of the more substituted alkene of 2 gave an aldehyde that was carried by the Corey–Fuchs protocol to the volatile enyne 15. This was cyclized with the Negishi reagent to an intermediate zirconacycle, that was oxidized to the diiodide. Elimination gave a diene, that was hydroborated with good kinetic control to give the alcohol 16. Oxidation followed by methylenation then completed the preparation of 2. The addition of an excess of the alkenyl lithium derived from 2, a 4:1 mixture of enantiomers, to the ketone 1 proceeded with remarkable diastereoselectivity.

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