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Journal articles on the topic 'Oxonium ions'

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Published: 4 June 2021
Last updated: 14 February 2022

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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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2

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Olah, George A., Hans Doggweiler, Jeff D. Felberg, and Stephan Frohlich. "Onium ions. 33. (Trimethylsilyl)- and [(trimethylsilyl)methyl]oxonium and halonium ions." Journal of Organic Chemistry 50, no. 24 (November 1985): 4847–51. http://dx.doi.org/10.1021/jo00224a039.

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12

Yang, Long, Jinliang Yang, Jun Nie, and Xiaoqun Zhu. "Temperature controlled cationic photo-curing of a thick, dark composite." RSC Advances 7, no. 7 (2017): 4046–53. http://dx.doi.org/10.1039/c6ra25346f.

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In this research, temperature controlled cationic mechanism resolved the issues of light penetration in colored thick composites due to the sustained stability of the secondary oxonium ions species at low temperature.
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13

Junk, Peter C. "Crown ethers as stabilising ligands for oxonium ions." New Journal of Chemistry 32, no. 5 (2008): 762. http://dx.doi.org/10.1039/b800122g.

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14

Chênevert, Robert, Daniel Chamberland, Michel Simard, and François Brisse. "Complexes of 18-crown-6 with oxonium ions derived from transition metal chlorides and hydrochloric acid: 18-crown-6.H3O+. FeCl4−, 18-crown-6.H3O+.InCl4−, (18-crown-6.H3O+)2.Pd2Cl62−." Canadian Journal of Chemistry 67, no. 1 (January 1, 1989): 32–36. http://dx.doi.org/10.1139/v89-006.

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The macrocyclic polyether 18-crown-6 forms complexes with hydrates of strong acids derived from transition metal chlorides and hydrochloric acid. The following charged-component complexes have been isolated and characterized: 18-crown-6.H3O+.FeCl4−, 18-crown-6.H3O+.InCl4−, and (18-crown-6.H3O+)2.Pd2Cl62−. X-ray diffraction study of the palladium complex is reported. The oxonium ion is located at the center of the macrocyclic ether cavity and the symmetry of the ring is close to D3d. Keywords: 18-crown-6 complexes, oxonium ions, X-ray diffraction, crystal structure
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15

Bowen, Richard D., William HC Martin, Charles E. Hudson, and David J. McAdoo. "Experimental and computational evidence for C=O π-bonding in [CH2OH]+ and related oxonium ions." European Journal of Mass Spectrometry 26, no. 3 (January 22, 2020): 187–94. http://dx.doi.org/10.1177/1469066719894969.

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The question of whether [CH2OH]+ should be described as the hydroxymethyl cation, +CH2OH, or protonated formaldehyde, CH2=OH+, is reconsidered in the light of experimental information and new computational evidence. Previous arguments that the charge distribution in [CH2OH]+ may be probed by considering the incremental stabilisation of [CH2OH]+ induced by homologation on carbon (to give [CH3CHOH]+) or oxygen (to produce [CH2OCH3]+) are critically examined. Cation stabilisation energies are shown to be better indicators of the nature of these oxonium ions. Further insight into the structure of larger CnH2n+1O+ oxonium ions is obtained by considering the site of protonation of enol ethers and related species. Computational information, including AIM (Atoms and Molecules) and NBA (Natural Bond Analysis) charges on the carbon and oxygen atoms in [CH2OH]+ and related species, is considered critically. Particular attention is focused on the calculated bond lengths and barriers to rotation about the C–O bond(s) in [CH2OH]+, [CH3CHOH]+, [(CH3)2COH]+, CH3OH and [CH2OCH3]+ and the C–N bond in [CH2NH2]+. Trends in these data are consistent with appreciable π-bonding only in the C–O connections which correspond to the C=O bond in the parent aldehyde or ketone from which the oxonium ion may be considered to be derived by protonation or alkyl cationation.
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16

Parker, Stewart F., and Shrey Shah. "Characterisation of hydration water in Nafion membrane." RSC Advances 11, no. 16 (2021): 9381–85. http://dx.doi.org/10.1039/d1ra00791b.

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Hydration of fully dried Nafion membrane results in the formation of oxonium ions of increasing complexity, up to H9O4+. Beyond this, water behaves as the bulk liquid.
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17

Dellon, Lauren D., Chun-Yi Sung, David J. Robichaud, and Linda J. Broadbelt. "Group Additivity Determination for Oxygenates, Oxonium Ions, and Oxygen-Containing Carbenium Ions." Industrial & Engineering Chemistry Research 56, no. 37 (September 6, 2017): 10259–70. http://dx.doi.org/10.1021/acs.iecr.7b02605.

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18

ZAHORSZKY, U. I. "ChemInform Abstract: Unimolecular Reactions of Bifunctional Aliphatic Oxonium Ions (Oxy Carbenium Ions)." ChemInform 24, no. 23 (August 20, 2010): no. http://dx.doi.org/10.1002/chin.199323314.

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19

Bowen, Richard D., Lisa N. Heydorn, and Johan K. Terlouw. "The chemistry of some low energy C5H9O+ oxonium ions." International Journal of Mass Spectrometry 209, no. 2-3 (September 2001): 153–69. http://dx.doi.org/10.1016/s1387-3806(01)00490-0.

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20

Wang, C. H., H. T. Zhang, X. X. Lu, G. Wu, X. H. Chen, and J. Q. Li. "Charge ordering in charge-compensated Na0.41CoO2 by oxonium ions." Solid State Communications 138, no. 4 (April 2006): 169–74. http://dx.doi.org/10.1016/j.ssc.2006.02.037.

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21

Bennett, Trystan, Alexander J. Falcinella, Reuben J. White, Rohul H. Adnan, Vladimir Golovko, Gunther G. Andersson, and Gregory F. Metha. "The effect of counter ions on the far-infrared spectra of tris(triphenylphosphinegold)oxonium dimer salts." RSC Advances 5, no. 91 (2015): 74499–505. http://dx.doi.org/10.1039/c5ra11599j.

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The far-infrared spectra of two tris(triphenylphosphinegold)oxonium dimer salts in the 50–800 cm−1 region were recorded using synchrotron-based IR radiation, and comprehensively assigned utilising density functional theory calculations.
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22

Haugan, Jarle André, Synnøve Liaaen-Jensen, Gudrun B. Paulsen, Johan Springborg, Dong-Ni Wang, Gudrun B. Paulsen, Ruby I. Nielsen, Carl E. Olsen, Christian Pedersen, and Carsten E. Stidsen. "Blue Carotenoids. Part 1. Novel Oxonium Ions Derived from Fucoxanthin." Acta Chemica Scandinavica 48 (1994): 68–75. http://dx.doi.org/10.3891/acta.chem.scand.48-0068.

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23

Kuznetsov, V. V. "Conformational properties of oxonium and sulfonium ions of 1,3-oxathiane." Chemistry of Heterocyclic Compounds 47, no. 2 (May 2011): 255–57. http://dx.doi.org/10.1007/s10593-011-0752-x.

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24

Fráter, Georg, Urs Müller, and Philip Kraft. "On the Scope of aPrins-Type Cyclization of Oxonium Ions." Helvetica Chimica Acta 87, no. 11 (November 2004): 2750–63. http://dx.doi.org/10.1002/hlca.200490248.

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25

Lesthaeghe, D., V. Van Speybroeck, G. B. Marin, and M. Waroquier. "What role do oxonium ions and oxonium ylides play in the ZSM-5 catalysed methanol-to-olefin process?" Chemical Physics Letters 417, no. 4-6 (January 2006): 309–15. http://dx.doi.org/10.1016/j.cplett.2005.09.136.

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26

Tanaka, Rikako, and Nobuyuki Matsushita. "Crystal structure of bis(1-ethylpyridinium) dioxonium hexacyanidoferrate(II)." Acta Crystallographica Section E Crystallographic Communications 73, no. 2 (January 20, 2017): 219–22. http://dx.doi.org/10.1107/s2056989017000810.

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The title compound, (C7H10N)2(H3O)2[Fe(CN)6] or (Etpy)2(H3O)2[Fe(CN)6] (Etpy+is 1-ethylpyridinium), crystallizes in the space groupPnnm. The FeIIatom of the [Fe(CN)6]4−anion lies on a site with site symmetry ..2/m, and has an octahedral coordination sphere defined by six cyanido ligands. Both the Etpy+and the oxonium cations are located on a mirror plane. In the crystal, electron-donor anions of [Fe(CN)6]4−and electron-acceptor cations of Etpy+are each stacked parallel to thebaxis, resulting in a columnar structure with segregated moieties. The crystal packing is stabilized by a three-dimensional O—H...N hydrogen-bonding network between the oxonium ions and the cyanide ligands of [Fe(CN)6]4−.
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27

Basko, Malgorzata. "Activated monomer mechanism in the cationic polymerization of L,L-lactide." Pure and Applied Chemistry 84, no. 10 (May 22, 2012): 2081–88. http://dx.doi.org/10.1351/pac-con-11-10-19.

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Cationic polymerization of L,L-lactide (LA) in the presence of trifluoromethanesulfonic acid (TfA) has been studied. It was found that propagation proceeds mainly according to the activated monomer (AM) mechanism. Hydroxyl groups required for this type of propagation are formed as a result of the ring opening of protonated lactide. Thus, part of the acid (acting as an initiator) is consumed for the generation of hydroxyl groups, and part (acting as a catalyst) is involved in the protonation of monomer molecules forming secondary oxonium ions which are then able to react with the hydroxyl groups. A dual role of the protic acid is reflected in the kinetic results and in the dependence of experimental degree of polymerization on theoretical values. The structure of active species responsible for polymer chain growth was determined by phosphorus ion-trapping method. The evidence that in the cationic ring-opening polymerization (ROP) of LA initiated by protic acids, both hydroxyl groups and secondary oxonium ions are present throughout the polymerization (as required for polymerization proceeding by the AM mechanism) was found on the basis of changes of the averaged proton chemical shift in 1H NMR spectra of LA polymerizing mixture.
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28

Kenzhegaliev, Akimgali, Sagat Zhumagaliev, Dina Kenzhegalieva, and Batyr Orazbayev. "Gas chromatographic-mass spectrometric investigation of n-alkanes and carboxylic acids in bottom sediments of the northern Caspian Sea." Geologos 24, no. 1 (March 1, 2018): 69–78. http://dx.doi.org/10.2478/logos-2018-0005.

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Abstract Prior to the start of experimental oil production in the Kashagan field (northern part of the Caspian Sea), n-alkanes and carboxylic acids contained in samples obtained from bottom sediments in the area of artificial island “D” were investigated by gas chromatography–mass spectrometry. Concentrations of 10 n-alkanes (composed of C10-C13, C15-C20) and 11 carboxylic acids (composed of C6-C12, C14-C16) were identified and measured. Concentrations of individual alkanes and carboxylic acids in bottom sediments of the various samples varied between 0.001 ÷ 0.88 μg/g and 0.001 ÷ 1.94 μg/g, respectively. Mass spectra, in particular the M+ molecular ion peak and the most intense peaks of fragment ions, are given. The present study illustrates the stability of molecular ions to electronic ionisation and the main fragment ions to the total ion current and shows that the initial fragmentation of alkanes implies radical cleavage of C2H5 rather than CH3. All aliphatic monocarboxylic acids studied were characterised by McLafferty rearrangement leading to the formation of F4 cation-radical with m/z 60 and F3 cation-radical with m/z 88 in the case of ethylhexanoic acid. The formation of oxonium ions presents another important aspect of acid fragmentation. Using mass numbers of oxonium ions and rearrangement ions allows determination of the substitution character in α- and β- C atoms. The essence of our approach is to estimate the infiltration of hydrocarbon fluids from the enclosing formation into sea water, comprising an analysis of derivatives of organic compounds in bottom sediments. Thus, concentrations of derived organic molecules can serve as a basis for estimates of the depth at which hydrocarbon fluids leak, i.e., to serve as an auxiliary technique in the search for hydrocarbon deposits and to repair well leaks.
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29

Laali, Khosrow, and George A. Olah. "Onium ions. 28. Methyl(4-diazoniophenyloxonium dication: a diazonium oxonium dication." Journal of Organic Chemistry 50, no. 16 (August 1985): 3006–7. http://dx.doi.org/10.1021/jo00216a043.

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30

Dobrzycki, Lukasz, Maksymilian Chruszcz, Wladek Minor, and Krzysztof Woźniak. "Stacks of DMANH+– scaffolding for ribbon shaped Cl−bridged oxonium ions." CrystEngComm 9, no. 2 (2007): 152–57. http://dx.doi.org/10.1039/b614785b.

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31

Kuznetsov, V. V. "Conformational properties of 2-methyl-1,3,2-oxazaborinane oxonium and ammonium ions." Russian Journal of General Chemistry 80, no. 8 (August 2010): 1726–27. http://dx.doi.org/10.1134/s1070363210080281.

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32

Kuznetsov, V. V. "Conformational behavior of 2-methyl-1,3,2-oxathiaborinane oxonium and sulfonium ions." Russian Journal of General Chemistry 81, no. 7 (July 2011): 1562–63. http://dx.doi.org/10.1134/s1070363211070279.

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33

Tu, Ya-Ping, and John L. Holmes. "Fragmentation of substituted oxonium ions: The role of ion-neutral complexes." Journal of the American Society for Mass Spectrometry 10, no. 5 (May 1999): 386–92. http://dx.doi.org/10.1016/s1044-0305(99)00004-5.

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34

Milliet, Arielle, and Georges Sozzi. "Stable γ-distonic oxonium ions: RHCHR′ĊH2CHR″ and their characteristic reaction." Organic Mass Spectrometry 25, no. 10 (October 1990): 522–26. http://dx.doi.org/10.1002/oms.1210251007.

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35

Milliet, Arielle, Georges Sozzi, and Henri E. Audier. "Formation of β-distonic oxonium ions: Study of ROCH2CH2OR′ radical cations." Organic Mass Spectrometry 27, no. 7 (July 1992): 787–94. http://dx.doi.org/10.1002/oms.1210270705.

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36

Sartori, Peter, Ralf Jüschke, Roland Boese, and Dieter Bläser. "Zur Struktur von Dihydroxonium Alkandisulfonaten / The Structure of Dihydroxonium Alkanedisulfonates." Zeitschrift für Naturforschung B 49, no. 11 (November 1, 1994): 1467–72. http://dx.doi.org/10.1515/znb-1994-1104.

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AbstractThe crystal structures of methanedisulfonic acid-(1) and 1,2-ethandisulfonic acid-dihydrate (2) have been determined from single crystal X-ray diffraction at T = 145 K (for 1) and T = 125 K (for 2). It has been found, that both acids exist in an ionic form as dihydroxonium sulfonates, but differ in the geometry of the sulfonate groups and in the positions of the hydrogen atoms at the oxonium ions.
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37

Mostaghimi, Farzin, Jens Bolsinger, Enno Lork, and Jens Beckmann. "New insights into the oxidation of phenoxatellurine with sulfuric acid." Main Group Metal Chemistry 42, no. 1 (October 1, 2019): 150–52. http://dx.doi.org/10.1515/mgmc-2019-0017.

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Abstract The oxidation of phenoxatellurine (PT) with conc. H2SO4 was reinvestigated. Two crystalline products, namely [PT2][H3O](SO4H)3 (1) and [PT](SO4) (2) were isolated and fully characterized by X-ray crystallography. The structure of 1 features [PT2]2+ dications giving rise to double-decker structures with two parallel PT layers that arise from dimerisation of two radical cations [PT]˙+. The [PT2]2+ dications and the hydrogensulfate ions are associated via secondary Te···O interations. The oxonium ion and the hydrogensulfate ions are involved in hydrogen bonding. The structure of 2 comprises ion pairs consisting of [PT]2+ dications and sulfate ions, which form a 2D coordination polymer. In addition, adjacent sulfate ions in the crystal lattice bind to tellurium atoms via secondary secondary Te···O interations.
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38

Calleja, Maria, Karin Johnson, Warwick J. Belcher, and Jonathan W. Steed. "Oxonium Ions from Aqua Regia: Isolation by Hydrogen Bonding to Crown Ethers." Inorganic Chemistry 40, no. 19 (September 2001): 4978–85. http://dx.doi.org/10.1021/ic010468i.

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39

Shaw, Jared T., and K. A. Woerpel. "Divergent diastereoselectivity in the addition of nucleophiles to tetrahydrofuran-derived oxonium ions." Tetrahedron 55, no. 29 (July 1999): 8747–56. http://dx.doi.org/10.1016/s0040-4020(99)00441-x.

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40

HAUGAN, J. A., and S. LIAAEN-JENSEN. "ChemInform Abstract: Blue Carotenoids. Part 1. Novel Oxonium Ions Derived from Fucoxanthin." ChemInform 25, no. 21 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199421210.

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41

Kuznetsov, V. V. "Conformational behavior of hexahydropyrimidin-2-one and its ammonium and oxonium ions." Chemistry of Heterocyclic Compounds 47, no. 5 (August 2011): 651–53. http://dx.doi.org/10.1007/s10593-011-0814-0.

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42

Hammerschmidt, Adrienne, Illenora Beckmann, Mechtild Läge, and Bernt Krebs. "A Novel Crown-Ether Stabilized Oxonium Halogenochalcogenate(IV): [H7O3(Bis-dibromo-dibenzo-30-crown-10)][Se2Br9]·1.5CH2Cl2." Zeitschrift für Naturforschung B 59, no. 11-12 (December 1, 2004): 1438–43. http://dx.doi.org/10.1515/znb-2004-11-1211.

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The title compound [H7O3(bis-dibromo-dibenzo-30-crown-10)][Se2Br9] ·1.5CH2Cl2 (1) was isolated from a solution of SeBr4 and dibenzo-30-crown-10 in CH3CN/CH2Cl2 containing a small amount of hydrobromic acid. During the reaction the crown ether is brominated by HBr. The compound crystallizes in the monoclinic space group P21/n with a = 17.688(11), b = 14.921(6), c = 20.521(12) Å , β = 97.71(5)°, and Z = 4. 1 is a novel example in the series of supramolecular halogenochalcogeno acids prepared in our group in which different oxonium cations are stabilized and encapsulated by crown ethers. Especially in this class of superacids complexation by cyclic polyethers offers covenient and variable possibilities for the controlled synthesis of oxonium cations. In the present case the large dibenzo-30-crown-10 ring systems are able to stabilize trinuclear [H7O3]+ cations within their cavities. Besides the macromolecular cations and some dichloromethane solvent molecules, the crystal structure of 1 contains molecular [Se2Br9]− ions with approximate D3h symmetry, each consisting of two face-sharing SeBr6 octahedra.
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Záhorszky, U. I. "Bifunctional even-electron ions: 1—Fragmentation behaviour of ω-methoxy-, ω-hydroxy- and ω-chloro-oxonium ions." Organic Mass Spectrometry 20, no. 10 (October 1985): 631–41. http://dx.doi.org/10.1002/oms.1210201008.

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de la Moya Cerero, Santiago, Hans-Ullrich Siehl, and Antonio García Martínez. "About the Existence of Organic Oxonium Ions as Mechanistic Intermediates in Water Solution." Journal of Physical Chemistry A 120, no. 36 (September 2016): 7045–50. http://dx.doi.org/10.1021/acs.jpca.6b06216.

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Shaw, Jared T., and K. A. Woerpel. "Divergent Diastereoselectivity in the Addition of Nucleophiles to Five-Membered-Ring Oxonium Ions." Journal of Organic Chemistry 62, no. 20 (October 1997): 6706–7. http://dx.doi.org/10.1021/jo971208e.

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Paquette, Leo, and Jingsung Tae. "Stereocontrolled Preparation of Spirocyclic Ethers by Intramolecular Trapping of Oxonium Ions with Allylsilanes." Journal of Organic Chemistry 62, no. 26 (December 1997): 9387–88. http://dx.doi.org/10.1021/jo974032p.

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Bowen, Richard D., Alex W. Colburn, and Peter J. Derrick. "Unimolecular reactions of isolated organic ions: The chemistry of the unsaturated oxonium ion." Organic Mass Spectrometry 27, no. 5 (May 1992): 625–32. http://dx.doi.org/10.1002/oms.1210270517.

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Sasmal, Pradip K., and Martin E. Maier. "Formation of Bicyclic Ethers from Lewis Acid Promoted Cyclizations of Cyclic Oxonium Ions." ChemInform 33, no. 35 (May 20, 2010): 43. http://dx.doi.org/10.1002/chin.200235043.

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Paquette, Leo A., and Jinsung Tae. "Stereocontrolled Preparation of Spirocyclic Ethers by Intramolecular Trapping of Oxonium Ions with Allylsilanes." Journal of Organic Chemistry 61, no. 22 (January 1996): 7860–66. http://dx.doi.org/10.1021/jo961306k.

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Sasmal, Pradip K., and Martin E. Maier. "Formation of Bicyclic Ethers from Lewis Acid Promoted Cyclizations of Cyclic Oxonium Ions." Organic Letters 4, no. 8 (April 2002): 1271–74. http://dx.doi.org/10.1021/ol025570d.

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