Relevant bibliographies by topics / 17-O nmr

Academic literature on the topic '17-O nmr'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "17-O nmr"

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Cerioni, Giovanni, Nicola Culeddu, and Antonio Saba. "O-17 NMR studies on ?-diazoketones." Journal of Physical Organic Chemistry 5, no. 7 (July 1992): 424–28. http://dx.doi.org/10.1002/poc.610050706.

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Gierczyk, Błażej, Maciej Zalas, Marcin Kaźmierczak, Jakub Grajewski, Radosław Pankiewicz, and Bożena Wyrzykiewicz. "17 O NMR studies of substituted 1,3,4-oxadiazoles." Magnetic Resonance in Chemistry 49, no. 10 (September 15, 2011): 648–54. http://dx.doi.org/10.1002/mrc.2804.

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ZEYER, MICHAELA, LIONEL MONTAGNE, CHRISTIAN JÄGER, and GERARD PALAVIT. "17O NMR OF CRYSTALLINE SODIUM TRIMETAPHOSPHATE." Phosphorus Research Bulletin 13 (2002): 275–78. http://dx.doi.org/10.3363/prb1992.13.0_275.

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Wzietek, P., D. Köngeter, P. Auban, D. Jérome, J. M. Bassat, J. P. Coutures, B. Dubois, and Ph Odier. "17 O NMR in YBa 2 Cu 3 O 7-δ Superconductors." Europhysics Letters (EPL) 8, no. 4 (February 15, 1989): 363–68. http://dx.doi.org/10.1209/0295-5075/8/4/011.

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Takigawa, M., P. C. Hammel, R. H. Heffner, Z. Fisk, K. C. Ott, and J. D. Thompson. "17 O NMR study of YBa 2 Cu 3 O 7−δ." Physica C: Superconductivity and its Applications 162-164 (December 1989): 853–56. http://dx.doi.org/10.1016/0921-4534(89)90492-9.

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Cerioni, Giovanni, Nicola Culeddu, and Antonio Plumitallo. "C-13 and O-17 NMR studies on N-sulfinylanilines." Tetrahedron 49, no. 14 (April 1993): 2957–64. http://dx.doi.org/10.1016/s0040-4020(01)80390-2.

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Pace, Vittorio, Wolfgang Holzer, Laura Ielo, Shicheng Shi, Guangrong Meng, Mina Hanna, Roman Szostak, and Michal Szostak. "17O NMR and15N NMR chemical shifts of sterically-hindered amides: ground-state destabilization in amide electrophilicity." Chemical Communications 55, no. 30 (2019): 4423–26. http://dx.doi.org/10.1039/c9cc01402k.

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We report17O NMR and15N NMR spectroscopic data for sterically-hindered acyclic amides. The data demonstrate that a combined use of17O NMR and15N NMR serves as a powerful tool in assessing electronic effects of the amide bond.
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Kitaoka, Y., Y. Berthier, P. Butaud, M. Horvatić, P. Ségransan, C. Berthier, H. Katayama-Yoshida, Y. Okabe, and T. Takahashi. "NMR study of 17 O in high T c superconducting oxides." Physica C: Superconductivity and its Applications 162-164 (December 1989): 195–96. http://dx.doi.org/10.1016/0921-4534(89)90984-2.

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Ogloblichev, Vasily V., Alexey G. Smolnikov, Almaz F. Sadykov, Yuri V. Piskunov, Alexander P. Gerashenko, Yuji Furukawa, Ken-ichi Kumagai, et al. "17 O NMR study of the triangular lattice antiferromagnet CuCrO 2." Journal of Magnetism and Magnetic Materials 458 (July 2018): 1–9. http://dx.doi.org/10.1016/j.jmmm.2018.02.080.

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Zhu, Xiao-Hong, Yi Zhang, Hannes M. Wiesner, Kamil Ugurbil, and Wei Chen. "In vivo measurement of CBF using 17 O NMR signal of metabolically produced H2 17 O as a perfusion tracer." Magnetic Resonance in Medicine 70, no. 2 (September 21, 2012): 309–14. http://dx.doi.org/10.1002/mrm.24469.

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Dissertations / Theses on the topic "17-O nmr"

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Yildirim, Erdem Kamil. "O-17 NMR studies of some silicate crystals and glasses." Thesis, University of Warwick, 2000. http://wrap.warwick.ac.uk/49950/.

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Crystalline and glassy silicates were investigated by means of 17O NMR. The dependence of the measured efg on the Si-O-Al bond angle was investigated in some crystalline aluminosilicate sodalites and kalsilite. The results show that CQ increases with increasing bond angle while 11 decreases with increasing bond angle and they both follow a similar function to that found for the Si-O-Si bond angle. The cluster calculations also confirm that the dependence of CQ and il on the Si-O-Al bond angle is similar to that of one Si-O-Si linkage. The chemical shift decreases as the bond angle increases. However this dependence does not seem to be monotonic. The structural role of Al in aluminosilicate glasses was studied by means of 17O 3Q MAS NMR in sodium aluminosilicate glasses with Si/Al= 3,1.5,1,0.7.3Q MAS NMR results showed the presence of Si-O-Si species as well as Si-O-Al species in glasses with Si/Al>1. The 3Q MAS NMR spectrum of glass with Si/A1=0.7 displayed the presence of Al-O-Al linkage as well as Si-O-Al. These results showed that as the Si/Al ratio decreases from 3 to 0.7 Si-O-Si linkage is replaced by Al-O-AI linkage as a result of addition of Al into the structure. The structural role of Sn in tin-silicate glasses was also studied mainly by means of 17O MAS NMR. The model developed from the 17O MAS NMR spectra of these glasses showed the possible coexistence of two and three coordinated oxygen atoms in the structure. Therefore some of the Sn has to be in three coordinated to oxygen for charge balancing. The 17O MAS NMR spectra of a partially crystallised sample showed three distinct sites which are assigned as Sn-O-Sn, Si-O-Sn, and Si-O-Si on the basis of their chemical shift. The CQ values obtained from the simulations of these peaks supports this assignment. The 29Si MAS NMR of the same sample showed two crystalline and a glassy peaks which are fitted to two crystalline and two glassy sites. The possible composition of this sample was calculated and found to be SiSn3O10.
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Nour, Sherif. "17-O NMR on Crystalline Hydrades Hydrates: Impact of Hydrogen Bonding." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32849.

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The water molecules in inorganic hydrate salts adopt different geometries and are involved in different hydrogen bond interactions. In this work, magic-angle spinning (MAS) and static 17O solid-state NMR experiments are performed to characterize the 17O electric field gradient (EFG) and chemical shift (CS) tensors of the water molecules in a series of inorganic salt hydrates which include: oxalic acid hydrate, barium chlorate hydrate, sodium perchlorate hydrate, lithium sulphate hydrate, and potassium oxalate hydrate, which were all enriched with 17O water. Data were acquired at magnetic field strengths of 9.4, 11.75, and 21.1 T. Gauge-including projector-augmented-wave density functional theory (GIPAW DFT) calculations are performed on barium chlorate hydrate and oxalic acid hydrate where structural changes including the Ow-H•••O distance, H-O-H angle, and O-H distance are employed to understand their impact on the NMR parameters. Furthermore, simplified molecular models consisting of a metal cation and a water molecule were built to establish the effect the M-Ow distance has on the parameters. The computational studies are then used to understand the experimental results. The 17O quadrupolar coupling constant ranged from 6.75 MHz in K2C2O4•H2O to 7.39 MHz in NaClO4•H2O while the asymmetry parameter ranged from 0.75 in NaClO4•H2O to 1.0 in K2C2O4•H2O and the isotropic chemical shift ranged from -15.0 ppm in NaClO4•H2O to 19.6 ppm in BaClO3•H2O. The computational results revealed the trends for each parameter, where there is an increasing trend for quadrupolar coupling constant and span as a function of increasing hydrogen bond distance, decreasing trend for the three chemical shift tensors as a function of increasing M-Ow distance and unclear trends for asymmetry parameter and skew due to competing electronic factors. Overall, this study provides benchmark 17O NMR data for water molecules in crystalline hydrates, including the first measurement of 17O chemical shift anisotropy for such materials.
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Groves, Ronald. "O17 Spin-lattice Relaxation Solid State NMR Studies of pure and doped Ices." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1021903674.

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Bussemer, Beate. "Ab initio-Untersuchung von 29 SI- und 17 O-NMR-chemischen Verschiebungen in Zeolithen und dichten SiO 2 -Modifikationen." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2000. http://dx.doi.org/10.18452/14511.

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In der vorliegenden Arbeit sollte untersucht werden, inwieweit man quantenchemische Methoden zur Berechnung von NMR-chemischen Verschiebungen auf Festkoerper anwenden kann. Es wurden die 29Si- und 17O-NMR-chemischen Verschiebungen von Zeolithen und dichten SiO2-Modifikationen berechnet. Dabei wurden zahlreiche Untersuchungen zur Abhaengigkeit der chemischen Verschiebung von der Festkoerperstruktur und von verschiedenen Parametern bei der Berechnung (Basissatz, Methode) durchgefuehrt. Die Qualitaet der Simulationen wurde an experimentellen Daten gemessen. Es konnte gezeigt werden, dass mit einer geeigneten Kombination von Rechenparametern eine Simulation von NMR-Spektren moeglich ist, die das Experimente sehr genau wiedergibt.
The following work studies, how far quantum chemical methods to compute NMR chemical shifts are applicable to solids. The 29Si and 17O NMR spectra of several zeolites and silicates were investigated. Numerous investigations were carried out to examine the dependence of the chemic al shift on the used zeolite structures and computing methods. The quality of the results was judged on experimental data. It could be shown, that a calculation of NMR spectra with a suitable combination of simulation parameters leads to results which reproduce very well the experimental results.
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Adjei-Acheamfour, Mischa [Verfasser], Roland [Akademischer Betreuer] Böhmer, and Franz [Gutachter] Fujara. "17 O-Zentrallinien-NMR- Untersuchungen der ultralangsamen Wassermoleküldynamik in Tetrahydrofuran-Clathrat-Hydrat und hexagonalem Eis / Mischa Adjei-Acheamfour. Betreuer: Roland Böhmer. Gutachter: Franz Fujara." Dortmund : Universitätsbibliothek Dortmund, 2016. http://d-nb.info/1112560807/34.

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Harman, David Grant, and harmandg@hotmail com. "Mechanisms of the Intriguing Rearrangements of Activated Organic Species." The Australian National University. Faculty of Science, 2003. http://thesis.anu.edu.au./public/adt-ANU20031210.143110.

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The β-acyloxyalkyl radical rearrangement has been known since 1967 but its mechanism is still not fully understood, despite considerable investigation. Since the migration of a β-trifluoroacetoxy group generally proceeds more rapidly and with more varied regiochemistry than its less electronegative counterparts, this reaction was studied in the hope of understanding more about the subtleties of the mechanism of the β- acyloxyalkyl radical rearrangement. The mechanism of the catalysed rearrangement of Nalkoxy- 2(1H)-pyridinethiones was also explored because preliminary studies indicated that the transition state (TS) for this process was isoelectronic with TSs postulated for the β-acyloxyalkyl radical and other novel rearrangements. ¶ A kinetic study of the rearrangement of the 2-methyl-2-trifluoroacetoxy-1-heptyl radical in solvents of different polarity was undertaken using a radical clock method. Arrhenius equations for the rearrangement in each solvent were: hexane, log10[kr (s-1)] = 11.8±0.3 – (48.9±0.7)/ θ; benzene, log10[kr (s-1)] = 12.0±0.2 – (43.7±0.8)/ θ; and propionitrile, log10[kr (s-1)] = 11.9±0.2 – (42.0±0.3)/ θ. Rate constants at 75˚C were: hexane, kr = 2.9 × 104; benzene, kr = 2.8 × 105; and propionitrile, kr = 4.0 × 105 s-1. The equilibrium constant for the reversible rearrangement at 80°C in benzene was 15.1
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Books on the topic "17-O nmr"

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Yildirim, Erdem Kamil. O-17 NMR studies of some silicate crystals and glasses. [s.l.]: typescript, 2000.

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Book chapters on the topic "17-O nmr"

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Urushihara, M., T. Nanba, Y. Miura, and S. Sakida. "A Theoretical Interpretation of 17 O NMR Spectra in Borosilicate Glasses." In Advances in Glass and Optical Materials II, 189–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144138.ch18.

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Trokiner, A., L. Le Noc, R. Mellet, D. Morin, Y. M. Gao, J. Primot, and J. Schneck. "NMR Investigation of Oxygen-17 in the Bi-Sr-Ca-Cu-O High-TC Superconductors." In 25th Congress Ampere on Magnetic Resonance and Related Phenomena, 267–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76072-3_138.

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Gerothanassis, Ioannis P., and George Varvounis. "17 O NMR Studies of Electronic and Steric Interactions of Quinoxaline-2(1H), 3(4H)-Dione Derivatives." In Spectroscopy of Biological Molecules: Modern Trends, 623–24. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5622-6_283.

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Nohara, A., M. Kageyama, S. Kuroki, and I. Ando. "A study of structure and dynamics of water and lysozyme protein in aqueous solution by pulsed-high-field-gradient spin-echo 1>H NMR and 17>O NMR methods." In From Colloids to Nanotechnology, 173–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-45119-8_29.

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Ohlin, C. André, and William H. Casey. "17 O NMR as a Tool in Discrete Metal Oxide Cluster Chemistry." In Annual Reports on NMR Spectroscopy, 187–248. Elsevier, 2018. http://dx.doi.org/10.1016/bs.arnmr.2018.01.001.

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Taber, Douglass F. "Oxidation of Organic Functional Groups." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0008.

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Cancheng Guo of Hunan University devised (J. Org. Chem. 2014, 79, 2709) con­ditions for the oxidative cleavage of an alkyne 1 to the esters 2 and 3. Hirokazu Arimoto of Tohoku University found (Chem. Commun. 2014, 50, 2758) that IBX oxidized a primary alcohol 4 to the acid 5 one carbon shorter. David Milstein of the Weizmann Institute of Science uncovered (J. Am. Chem. Soc. 2014, 136, 2998) condi­tions for the direct oxidation of the cyclic amine 6 to the lactam 7, with concomitant evolution of H₂. Cyclic ene sulfonamides such as 9 are versatile synthetic intermediates. Henri Doucet of the Université de Rennes reported (Adv. Synth. Catal. 2014, 356, 119) the regioselective conversion of 8 to 9. In this case, the oxidizing agent was the organo-PdBr intermediate. There have been many reports of the functionalization of the oxygenated carbons of cyclic ethers, as exemplified by the conversion of 10 to 11, observed (J. Org. Chem. 2014, 79, 3847) by Jianlin Han of Nanjing University. If these methods were regiose­lective with an acyclic benzyl ether, this could be a new method for the removal of that common protecting group. Jianliang Xiao of the University of Liverpool described (J. Am. Chem. Soc. 2014, 136, 8350) a selective benzylic ether oxidation that converted 12 to 13. Baris Temelli of Hacettepe University effected (Synthesis 2014, 46, 1407) the conversion of a primary nitro compound 14 into the corresponding nitrile 15. Jean- Michel Vatèle of Université Lyon 1 oxidized (Synlett 2014, 25, 1275) the primary alcohol 16 to the nitrile 17. Many methods have been put forward for the oxidation of primary alcohols to alde­hydes and secondary alcohols to ketones. Piperidinium oxy radicals such as TEMPO are widely used to catalyze this transformation. Yoshikazu Kimura of Iharanikkei Chemical Industry Co. Ltd. established (Synlett 2014, 25, 596) a manufacturing proc­ess for crystalline NaOCl•5H₂O that served as the bulk oxidant for the conversion of 18 to 19. Neither a ketone nor an aldehyde was chlorinated under the reaction condi­tions. Yoshiharu Iwabuchi of Tohoku University showed (Angew. Chem. Int. Ed. 2014, 53, 3236) that with his piperidinium oxy radical AZADO and Cu catalysis, air could be the bulk oxidant for the otherwise difficult conversion of the amino alcohol 20 to the amino ketone 21.
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Taber, Douglass F. "C–O Ring-Containing Natural Products: (+)-Isatisine A (Panek), Cephalasporolide E (Sartillo-Piscil), (+)-Xestodecalactone ( Jennings), Colchilomycin B (Banwell), Lactimidomycin (Georg), 5,6-Dihydrocineromycin B (Fürstner)." In Organic Synthesis. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190646165.003.0052.

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(+)-Isatisine A 4 was isolated from Isatis indigotica, long used in traditional Asian medicine for the treatment of viral diseases. James S. Panek of Boston University set the stage (J. Org. Chem. 2015, 80, 2959) for the synthesis of 4 by the addition of the allyl silane 2 to the aldehyde 1 to give the highly substituted tetrahydrofuran 3. Fernando Sartillo- Piscil of Benemérita Universidad Autónoma de Puebla devised (J. Org. Chem. 2015, 80, 2601) an H-atom abstraction/fragmentation/cyclization cascade that converted 5 into the spiroketal cephalosporolide E 7. Cephalosporolide F, the unstable kinetic product from the cyclization, could be observed in the NMR spectrum of the crude product when a base was added. (+)-Xestodecalactone A 10 was isolated from the fungus Pencillium cf. mon­tanese, that was secured from the marine sponge Xestospongia exigua. Michael P. Jennings of the University of Alabama constructed (Eur. J. Org. Chem. 2015, 3303) the macrolactone of 10 by cyclizing the carboxylic acid 8 to 9 under Friedel-Crafts conditions. Colchilomycin B 13, isolated (without acetone!) from the marine fungus Cochliobolus lunatus, is a naturally occurring acetonide. Martin G. Banwell of the Australian National University showed (J. Org. Chem. 2015, 80, 460) that the Nozaki–Hiyama–Kishi cyclization of 11 to 12 proceeded with high diastereoselectivity. Lactimidomycin 16 binds to and so blocks the tRNA E-site of the 80S ribosome. Gunda I. Georg of the University of Minnesota assembled (Chem. Commun. 2015, 51, 8634) the macrolide triene of 16 by the cyclization of 14 to 15. Alois Fürstner of the Max-Planck-Institut für Kohlenforschung, who developed effective catalysts for alkyne metathesis, has been exploring (Angew. Chem. Int. Ed. 2015, 54, 6241) the conversion of the product cyclic alkynes to trisubstituted alkenes. In the synthesis of 5,6-dihydrocineromycin B 19, he took advantage of the directing propargylic alcohol for the conversion of 17 to 18.
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Conference papers on the topic "17-O nmr"

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Bitencourte, Adakrishna, and Márcia Rendeiro. "Protótipo do aplicativo Ergon para informação e conscientização ergonômica." In Anais Principais do Simpósio Brasileiro de Computação Aplicada à Saúde. Sociedade Brasileira de Computação - SBC, 2020. http://dx.doi.org/10.5753/sbcas.2020.11545.

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Este trabalho apresenta o protótipo do aplicativo (app) Ergon, o qual permite o acesso às informações para conscientização ergonômica de empresas e trabalhadores, com objetivo de contribuir nas ações de identificação e prevenção de riscos ergonômicos que podem acarretar em danos à saúde do trabalhador. O conteúdo do app foi baseado nos aspectos das condições de trabalho abordadas na Norma Regulamentadora 17 – NR 17, da Secretaria do Trabalho do Brasil.
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Reports on the topic "17-O nmr"

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Clark, D. L., T. W. Newton, P. D. Palmer, and B. D. Zwick. {sup 13}C and {sup 17}O NMR binding constant studies of uranyl carbonate complexes in near-neutral aqueous solution. Yucca Mountain Project Milestone Report 3351. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/32395.

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Alam, Todd M., and Brendan W. Wilson. Investigating the Hydrolysis Reactions of a Chemical Warfare Agent Surrogate. A Systematic Study using 1H, 13C, 17O, 19F, 31P, and 35Cl NMR Spectroscopy. Office of Scientific and Technical Information (OSTI), July 2015. http://dx.doi.org/10.2172/1211578.

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