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Relevant bibliographies by topics / Oxonium ions

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Academic literature on the topic 'Oxonium ions'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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Journal articles on the topic "Oxonium ions"

1

PETKEWICH, RACHEL. "TAMING ALKYL OXONIUM IONS." Chemical & Engineering News 86, no. 39 (September 29, 2008): 10. http://dx.doi.org/10.1021/cen-v086n039.p010.

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Tedder, John M., and G. Stewart Walker. "Investigations of oxonium ions." Journal of the Chemical Society, Perkin Transactions 2, no. 3 (1991): 317. http://dx.doi.org/10.1039/p29910000317.

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3

TEDDER, J. M., and G. S. WALKER. "ChemInform Abstract: Investigations of Oxonium Ions." ChemInform 22, no. 23 (August 23, 2010): no. http://dx.doi.org/10.1002/chin.199123088.

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Mascal, Mark, Nema Hafezi, Nabin K. Meher, and James C. Fettinger. "Oxatriquinane and Oxatriquinacene: Extraordinary Oxonium Ions." Journal of the American Chemical Society 130, no. 41 (October 15, 2008): 13532–33. http://dx.doi.org/10.1021/ja805686u.

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Lielpetere, Anna, and Aigars Jirgensons. "Carbenium ion formation by fragmentation of electrochemically generated oxonium ions." Organic & Biomolecular Chemistry 16, no. 28 (2018): 5094–96. http://dx.doi.org/10.1039/c8ob01339j.

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Stogniy, Marina Yu, Ekaterina N. Abramova, Irina A. Lobanova, Igor B. Sivaev, Vikentii I. Bragin, Pavel V. Petrovskii, Viktoria N. Tsupreva, Olga V. Sorokina, and Vladimir I. Bregadze. "Synthesis of Functional Derivatives of 7,8-Dicarba-nido-undecaborate Anion by Ring-Opening of Its Cyclic Oxonium Derivatives." Collection of Czechoslovak Chemical Communications 72, no. 12 (2007): 1676–88. http://dx.doi.org/10.1135/cccc20071676.

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A new approach to synthesis of functional derivatives of 7,8-dicarba-nido-undecaborate anion based on ring-opening of its cyclic oxonium derivatives [10-(CH2)4O-7,8-C2B9H11] and [10-O(CH2CH2)2O-7,8-C2B9H11] with various nucleophiles was developed. Both cyclic oxonium derivatives can be obtained as single isomers by reaction of the parent anion [7,8-C2B9H12]- with mercury(II) chloride in the corresponding solvents. Mechanism of formation of the cyclic oxonium derivatives of 7,8-dicarba-nido-undecaborate anion was proposed. A series of 7,8-dicarba-nido-undecaborate derivatives with terminal carboxylic and azide functions were prepared by the ring-opening reactions of the cyclic oxonium derivatives with substituted phenolate and azide ions, respectively.

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Du, Qinghua, Dawei Song, Wansheng You, Yi Zhao, Tingting Gan, and Limei Dai. "Synthesis, Crystal Structure and Electrochemical Properties of a New Adduct of Benzo-15-crown-5 and H3PMo12O40." Zeitschrift für Naturforschung B 64, no. 3 (March 1, 2009): 274–80. http://dx.doi.org/10.1515/znb-2009-0304.

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A new crown ether-POM (POM = polyoxometalate) adduct with the molecular formula [(C14- H20O5)4(H3O)3]PMo12O40 ・ 0.5CH3CN (1) was isolated from the mixed solvent of acetonitrile and methanol. The adduct is constructed from Keggin [PMo12O40]3− anions and [(C14H20O5)- (H3O+)] and [(C14H20O5)2(H3O+)] cations via electrostatic and hydrogen bonding interactions. The supramolecular interactions combine the crown ether with oxonium ions. In the [(C14H20O5)- (H3O+)] moieties, the oxonium ions reside out of the planes defined by the oxygen atoms of the crown ether. The [(C14H20O5)2(H3O+)] moieties exhibit a sandwich structure. There exist hydrogen bonds between the oxonium ions of the [(C14H20O5)(H3O)]+ cations and the acetonitrile molecules and the terminal and bridging oxygen atoms of the [PMo12O40]3− anions. The adduct has been used as a bulk-modifier to fabricate a chemically modified carbon paste electrode (MCPE), which displays well-defined cyclic voltammograms with three reversible two-electron redox couples in acidic aqueous solution, and electrocatalytic activities towards the reduction of H2O2 and NO2−.

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Záhorszky, U. I. "Unimolecular reactions of bifunctional aliphatic oxonium ions (oxy carbenium ions)." Mass Spectrometry Reviews 11, no. 5 (September 1992): 343–88. http://dx.doi.org/10.1002/mas.1280110502.

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Pirro, Martina, Yassene Mohammed, Arnoud H. de Ru, George M. C. Janssen, Rayman T. N. Tjokrodirijo, Katarina Madunić, Manfred Wuhrer, Peter A. van Veelen, and Paul J. Hensbergen. "Oxonium Ion Guided Analysis of Quantitative Proteomics Data Reveals Site-Specific O-Glycosylation of Anterior Gradient Protein 2 (AGR2)." International Journal of Molecular Sciences 22, no. 10 (May 20, 2021): 5369. http://dx.doi.org/10.3390/ijms22105369.

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Developments in mass spectrometry (MS)-based analyses of glycoproteins have been important to study changes in glycosylation related to disease. Recently, the characteristic pattern of oxonium ions in glycopeptide fragmentation spectra had been used to assign different sets of glycopeptides. In particular, this was helpful to discriminate between O-GalNAc and O-GlcNAc. Here, we thought to investigate how such information can be used to examine quantitative proteomics data. For this purpose, we used tandem mass tag (TMT)-labeled samples from total cell lysates and secreted proteins from three different colorectal cancer cell lines. Following automated glycopeptide assignment (Byonic) and evaluation of the presence and relative intensity of oxonium ions, we observed that, in particular, the ratio of the ions at m/z 144.066 and 138.055, respectively, could be used to discriminate between O-GlcNAcylated and O-GalNAcylated peptides, with concomitant relative quantification between the different cell lines. Among the O-GalNAcylated proteins, we also observed anterior gradient protein 2 (AGR2), a protein which glycosylation site and status was hitherto not well documented. Using a combination of multiple fragmentation methods, we then not only assigned the site of modification, but also showed different glycosylation between intracellular (ER-resident) and secreted AGR2. Overall, our study shows the potential of broad application of the use of the relative intensities of oxonium ions for the confident assignment of glycopeptides, even in complex proteomics datasets.

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Rajasekhar, Tota, Jack Emert, and Rudolf Faust. "Synthesis of highly reactive polyisobutylene by catalytic chain transfer in hexanes at elevated temperatures; determination of the kinetic parameters." Polymer Chemistry 8, no. 18 (2017): 2852–59. http://dx.doi.org/10.1039/c7py00415j.

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Dissertations / Theses on the topic "Oxonium ions"

1

Donohoe, Timothy J. "Chiral oxonium ions." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314854.

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Schubert, Jeffrey W. "The structure of bromonium, chloronium, and oxonium ions." Click here for download, 2008. http://proquest.umi.com/pqdweb?did=1537007641&sid=1&Fmt=2&clientId=3260&RQT=309&VName=PQD.

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Bouillon, Nelly. "Homopolymérisation des époxy par les complexes BF3-amines." Lyon, INSA, 1988. http://www.theses.fr/1988ISAL0037.

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Le travail présenté concerne l’étude de l’homopolymérisation cationique des époxy amorcée par les complexes BF3- amine en présence d'un diol. La synthèse de différents complexes et leur dissolution dans un diol a permis de montrer l’influence de la basicité de l’amine complexée sur leur réactivité avec un prépolymère DGEBA n = 0,03. Dans un deuxième temps nous avons étudié le mécanisme de polymérisation d'un mono époxy amorcée par le complexe BF3 - 4-chloroaniline en présence d'un poly oxyde d'éthylène glycol de masse 300. La réaction a pu être décrite par la compétition entre deux mécanismes l'un faisant intervenir un centre actif oxonium tertiaire et l'autre un oxonium secondaire. Dans une deuxième partie nous avons appliqué ce système de polymérisation à la formation d'un réseau tridimensionnel avec un prépolymère diépoxy la DGEBA n =0,03.

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Guillonneau, Loïc. "Etudes de voies de synthèses du SSR149415." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13346.

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Le SSR149415 est une nouvelle molécule visant à traiter les troubles de l'émotion comme le stress et l'anxiété en ciblant les récepteurs V1b de la vasopressine impliqués dans l'émotivité. Au cours de cette thèse, nous avons cherché à développer une nouvelle voie d'accès originale et efficasse au SSR149415, noyau oxoindole α-α' substitué de configuration (R). [Schéma de la molécule SSR149415 dans le résumé d'origine] Les étapes clés des différentes approches entreprises sont une réation de Petasis suivie, soit d'une α-arylation intramoléculaire d'une fonction ester, soit d'une α-arylation intermoléculaire d'une fonction ester ou une N-arylation d'amide. Une réaction inattendue lors de notre étude nous a conduit à décrire une voie d'accès originale a des dérivés de type benzoxazines, basée sur une réation d'arylation intermoléculaire d'un sel d'oxonium.

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Godoy, Junior Luiz Antonio Fonseca de. "Sintese da 5-monobromocavernicolina e do 3-bromoverongiaquinol : reações de adição de nucleofilos de carbono a ions oxonios ciclicos em sistemas sem solvente." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249253.

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Orientador: Ronaldo Aloise Pilli
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica
Made available in DSpace on 2018-08-10T06:40:57Z (GMT). No. of bitstreams: 1 GodoyJunior_LuizAntonioFonsecade_M.pdf: 2690329 bytes, checksum: e0dd006f51f8ae2ed9fc689def1c7773 (MD5) Previous issue date: 2006
Resumo: A dissertação foi dividida em duas partes, a primeira trata da síntese de produtos naturais isolados de esponjas marinhas e a segunda parte trata de reações de adição de nucleófilos à íons oxônios cíclicos na ausência de solvente. A 5-monobromocavernicolina, isolada pela primeira vez em 1984 da esponja marinha Aplysina cavernicola por Pietra e colaboradores, foi recentemente isolada por Berlinck e colaboradores a partir da esponja Aplysina fulva, este foi o primeiro composto em forma quase racêmica (6% ee) isolado de um organismo marinho. O composto 3-bromoverongiaquinol também foi isolado a partir da esponja marinha Aplysina cavernicola, estudos biológicos mostraram que ambos os compostos apresentam atividade bactericida. Na síntese da 5-monobromocavernicolina realizou-se a reação de adição do tipo 1,2 do enolato de lítio de BSA à 1,4-benzoquinona obtendo-se o produto em 56%. Em seguida, realizou-se uma reação de bromoção na presença de bromo molecular, a purificação desta reação em coluna cromatográfica de sílica gel promoveu a eliminação de HBr fornecendo assim o produto 3-bromoverongiaquinol em 50% de rendimento global a partir da 1,4-benzoquinona, rendimento superior aos já relatados na literatura (2,5 e 6,3%). O bruto da reação de bromoção foi ciclizado em meio básico resultando na 5-monobromocavernicolina. Anéis tetraidropirânicos e tetraidrofurânicos com substituintes na posição 2 do anel estão presentes em muitos produtos naturais biologicamente ativos. Realizou-se as reações de adição de nucleófilos de carbono à íons oxônios cíclicos na presença de 20 mol% de tricloreto de índio em sistemas sem solvente, o que é ambientalmente favorável. Observou-se que quanto maior o valor de p a do nucleófilo melhores são os rendimentos e mais rápidas são as reações
Abstract: This dissertation is divided in two parts. The first part presents the synthesis of natural products isolated from marine sponges. The second part presents investigations on the addition of carbon nucleophiles to cyclic N-acyliminium and oxonium ions under solvent-free conditions. The natural product 5-monobromocavernicolin was isolated for the first time from the marine sponge Aplysina cavernicola by Pietra and collaborators in 1984. The same compound was recently isolated by Berlinck and collaborators from the sponge Aplysina fulva. 5-monobromocavernicolin was the first compound isolated from a marine organism in a quasi-racemic form (6% ee). The compound 3-bromoverongiaquinol was also isolated from the marine sponge Aplysina cavernícola and biological studies showed that both compounds presents bactericidal activity. In the present investigation, the synthesis of 5-monobromocavernicolin was carried out by 1 ,2 addition of the BSA lithium enolate to 1,4-benzoquinone, to give the product in 56% yield. A bromation reaction was carried out with bromine and the purification of the corresponding product by silica gel column chromatography promoted elimination of HBr, provinding 3-bromoverongiaquinol in 50% of global yield from 1,4-benzoquinone. It's worth to mention that this yield is superior compared to those already reported in the literature (2,5 e 6,3%). The crude product of the bromation reaction was then cyclized in alkaline medium resulting in the formation of 5-monobromocavernicolin. The second part of this dissertation describes the preparation of tetrahydrofurans and tetrahydropyrans with substituents adjacent to the ring oxygen atom. Related compounds are frequently found in several biologically active natural products. The addition reaction of carbon nucleophiles to oxonium ions were investigated in the presence of InCl3 (20 mol%) and under solvent free conditions, an environmentally friendly procedure. It was observed that nucleophiles with higher p a values promote faster addition reaction in higher yields
Mestrado
Quimica Organica
Mestre em Química

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6

Khadraoui, Habib. "Contribution à l'étude de dérivés dihydroxy-tétraphosphoniques : structure cristalline de l'acide dihydroxy -1,6 hexylidène tétraphosphonique - 1,1',6,6' et de ses sels de potassium, sodium et cuivre." Châtenay-Malabry, Ecole centrale de Paris, 1993. http://www.theses.fr/1993ECAP0304.

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Notre travail a porté sur la synthèse et l'étude structurale par diffraction des rayons X de l'acide dihydroxy-1,6 hexylidène tétraphosphonique-1,1,6,6 (DHHTP: C6 H18 O14 P4. 4,5H2O) et de ses trois sels, sodium, potassium et cuivre. L'étude diffractométrique a établi la stoechiométrie de ses composés. Nous avons montré l'isomorphisme entre le sel de potassium et l'acide libre qui est en fait un sel d'oxonium; ce cation occupe les sites cristallographiques du cation potassium. La coordination est octaédrique pour Cu2+ et Na+, la coordinence de K+ et 8. Pour Na+ et K+, deux polyèdres de coordination voisins, partagent une arête ou une face, les deux cations au centre de chacun des polyèdres sont à courte distance l'un de l'autre. La molécule de DHHTP est centrosymétrique. La chaine hydrocarbonée est en extension maximale pour les sels d'oxonium, potassium et cuivre. Avec le sel de sodium, la centrosymétrie, rigoureuse entre groupes hydroxy-diphosphoniques, est statistique au niveau de la chaine carbonée qui présente deux conformations coudées possibles. Les deux groupes phosphoniques d'un même groupe hydroxy-diphosphinique sont éclipsés pour le sel de cuivre mais très décalés pour le sel de sodium, un peu moins dans le cas du sel de potassium. Ceci est dû aux contraintes du champ cristallin qui sont importantes du fait de la fonctionnalisation des deux extrémités de la chaine carbonée. La molécule fait preuve d'une grande flexibilité lui permettant de s'adapter aux conditions qui assurent la stabilité du cristal. D'après les longueurs trouvées pour les liaisons P-O et pour les quatre composés, les groupes phosphoniques participent à des transferts de densité de charge électronique par le biais de liaisons hydrogène fortes. Dans le cas des trois sels, d'oxonium, potassium et cuivre ce phénomène s'accompagne d'un désordre sur la position et la présence partielle de certains atomes d'hydrogène. La comparaison de ces résultats très variés a été faite avec ceux obtenus avec les dérivés hydroxy-diphosphoniques. Elle montre la spécificité et l'originalité de notre contribution.

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Douguet, Nicolas. "Symmetry in the dissociative recombination of polyatomic ions and in ultra-cold few body collisions." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4654.

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We discuss the role of symmetries in the dissociative recombinations (DR) of three polyatomic ions, namely the linear HCO+ (formyl) ion and the two highly symmetric H+3 and H3O+ (hydronium) molecular ions. Regarding the HCO+ ion, we apply a quantum mechanical treatment using the Multi-channel Quantum Defect Theory (MQDT) formalism to describe the ion-electron scattering process. Our study takes into account the Renner-Teller effect in order to model the non Born-Oppenheimer vibronic coupling in linear polyatomic ions. The coupling has shown to represent the main mechanism responsible for electronic capturing in highly excited Rydberg states associated with excited vibrational levels of the ionic core. We consider all internal degrees of freedom of HCO+ and obtain the dissociative cross section as a function of the incident electron kinetic energy. We have also improved the theoretical approach by including the large permanent dipole moment of HCO+ using a generalization of the MQDT formalism. To our knowledge, this is the rst time the permanent dipole moment of an ion is included in a DR study. The obtained results are in good agreement with experimental data. We also study the DR of H+3 and H3O+ symmetric ions using a simpli ed theoretical treatment, which focuses on the key ingredient of the DR process, the electron capture in the rst excited degenerate vibrational normal mode of the ions through non Born-Oppenheimer Jahn-Teller coupling. For both ions the obtained cross sections are in very good agreement with the available experimental data. Moreover, in the case of H+3 , the results reproduce previous calculations from two independent theoretical studies. Finally, we investigate the role of symmetries in few body ultra-cold collisions by considering both three and four identical atoms systems. We derive allowed rearrangements of different fragments of the system, satisfying the complete symmetry of the molecular Hamiltonian. For that purpose we establish a correspondence between constants of motion of the system in di erent large-distance con gurations and irreducible representations of the total symmetry group. Selection rules (forbidden transitions) and allowed states, which depend on the fermionic or bosonic nature of the atoms, can be derived from these results.
ID: 029050862; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2010.; Includes bibliographical references (p. 226-232).
Ph.D.
Doctorate
Department of Physics
Sciences

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Stewart, Craig. "Oxonium Ylide Rearrangements: A Novel Approach Towards the Synthesis of the Phorbol Skeleton." Phd thesis, 2010. http://hdl.handle.net/10048/961.

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Thesis (Ph. D.)--University of Alberta, 2010.
Title from pdf file main screen (viewed on June 22, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Department of Chemistry, University of Alberta. Includes bibliographical references.

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Book chapters on the topic "Oxonium ions"

1

Gooch, Jan W. "Oxonium Ion." In Encyclopedic Dictionary of Polymers, 511. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8330.

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"Oxonium, Sulfonium and Selenonuum and Telluronuim Ions." In World Scientific Series in 20th Century Chemistry, 711. World Scientific Publishing Company, 2003. http://dx.doi.org/10.1142/9789812791405_others16.

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OLAH, GEORGE A., JAMES J. SVODODA, and ALICE T. KU. "Onium Ions. VIII: Selenonium and Telluronium Ions and Their Comparison with Oxonium and Sulfonium Ions." In World Scientific Series in 20th Century Chemistry, 730–33. World Scientific Publishing Company, 2003. http://dx.doi.org/10.1142/9789812791405_0133.

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4

"oxonium ion." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 956. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_151572.

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"Oxonium ion." In Encyclopedic Dictionary of Polymers, 688. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_8191.

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Frey, Perry A., and Adrian D. Hegeman. "Glycosyl Group Transferases." In Enzymatic Reaction Mechanisms. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780195122589.003.0016.

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Glycosyl group transfer underlies the biosynthesis and breakdown of all nucleotides, polysaccharides, glycoproteins, glycolipids, and glycosylated nucleic acids, as well as certain DNA repair processes. Glycosyl transfer consists of the transfer of the anomeric carbon of a sugar derivative from one acceptor to another, as in, which describes the transfer of a generic pyranosyl ring between nucleophilic atoms :X and :Y of acceptor molecules. The stereochemistry at the anomeric carbon is not specified in eq. 12-1, but the leaving group occupies the axial position in an α-anomer or the equatorial position in a β-anomer. The overall transfer can proceed with either retention or inversion of configuration. In biochemistry, the acceptor atoms can be oxygen, nitrogen, sulfur, or in the biosynthesis of C-nucleosides even carbon. The great majority of biological glycosyl transfer reactions involve transfer between oxygen atoms of different acceptor molecules. Enzymes catalyzing glycosyl transfer are broadly grouped according to whether the acceptor :Y–R2 in is water or another molecule. In the actions of glycosidases, the acceptor is water, and glycosyl transfer results in hydrolysis of a glycoside, a practically irreversible process in dilute aqueous solutions. In the action of glycosyltransferases, the acceptors are molecules with hydroxyl, amide, amine, sulfhydryl, or phosphate groups. The simplest nonenzymatic glycosyl transfer reaction is the hydrolysis of a glycoside, and early studies revealed the fundamental fact that glycosides are much less reactive toward hydrolysis in basic solutions than in acidic solutions. This fact underlies much that is known about the mechanism of glycosyl transfer; that is, the anomeric carbon of a glycoside is remarkably unreactive toward direct nucleophilic attack, but it becomes reactive when one of the oxygens is protonated by an acid, as illustrated in fig. 12-1 for the acid-catalyzed hydrolysis of a generic glycoside. The reaction by both mechanisms in fig. 12-1 proceeds by pre-equilibrium protonation of the glycoside to form oxonium ion intermediates, which are subject to hydrolysis by water. The two mechanisms in fig. 12-1 are of interest. The mechanism proceeding through exocyclic cleavage of the glycoside has historically been regarded as the more likely, and for this reason, the route through endocyclic cleavage has received little consideration.

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Conference papers on the topic "Oxonium ions"

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Ueda, Koji, Atsuhiko Toyama, Taka-Aki Sato, Yusuke Nakamura, and Hidewaki Nakagawa. "Abstract 3214: Definition of biosimilars: Energy Resolved Oxonium Ion Monitoring (Erexim) technology grasps detailed N-glycan microheterogeneity on therapeutic antibodies." In Proceedings: AACR 104th Annual Meeting 2013; Apr 6-10, 2013; Washington, DC. American Association for Cancer Research, 2013. http://dx.doi.org/10.1158/1538-7445.am2013-3214.

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2

Sakai, Kiminori, and Takashi Tokumasu. "Molecular Dynamics Study of Oxygen Permeation Through the Ionomer of PEFC Catalyst Layer." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-36020.

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Polymer electrolyte membrane fuel cell (PEFC) is focused worldwide as the energy conversion device of next generation. In the PEFC cathode catalyst layer, an ionomer with which the catalyst is covered is very important on the point of transferring protons to the catalytic surface on the cathode side. On the other hand, it is said that an ionomer interferes with oxygen permeation to the catalytic surface. The mechanism of oxygen permeation through an ionomer was not analyzed in detail because it is too small to research by experiment. Moreover molecular dynamics simulation of the catalyst layer and oxygen permeability has not yet studied. In this research, we constructed the system including nafion, water, oxonium ion, platinum layers by using molecular dynamics study, and studied about the effect of the water content of the ionomer on the structure of the ionomer and permeability of the oxygen molecule. As the results, a lot of oxygen molecules permeated through a dried ionomer and reached to the catalytic surface but there were few oxygen molecules that permeated through a hydrated ionomer and reached there. In addition, it is found that the shape of the ionomer in the case of water content rate γ = 3, 7, 11 changed.

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