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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"¹³C NMR spectroscopy"”.
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Metabolic flux, transport activity, and subcellular communication in intact hearts from dynamic ¹³C NMR spectroscopy
… carbon-13 (13C) nuclear magnetic resonance (NMR) spectroscopy to determine the ratelimiting steps in 13C labeling of glutamate. 13C NMR spectra were acquired from isolated rabbit hearts perfused with either 2.5 mM [2- 13C] acetate or 2.5 mM [2- 13C] butyrate, and with or without KCl arrest. …
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Synthesis and properties of lignin epoxide
… of the product was identified with IR, ¹H and ¹³C NMR spectroscopy. The lignin epoxide was synthesized by reacting hydroxyalkylated (hydroxypropyl and hydroxybutyl) lignin with epichlorohydrin using the reaction conditions defined by the model compound studies. The reaction was studied at …
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Oxidative addition of N-H and O-H bonds to iridium: developing active catalysts for N-H and O-H additions to unsaturates
… an Ir-N bond was established by ¹H, ³¹P and ¹³C NMR spectroscopy, IR spectroscopy, C-H analyses and single crystal x-ray diffraction. Similarly, oxidative addition of the O-H bond of phenol, p-cresol, 3,5-dimethylphenol, and water to [Ir(COD)(PMe₃)₃]CI (la) produces mer-Ir(OR)H(PMe₃)₃C1 …
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Synthesis, characterisation and reactivity studies of μ(α, ω)-alkanediyl complexes of ruthenium, iron and cobalt
… characterised by microanalysis, infrared, ¹H and ¹³C NMR spectroscopy, melting point and mass spectrometry. The new heterodinuclear complex [Cp(CO)₂Fe(CH₂)₄Ru(CO)₂Cp] has been synthesised by the reaction of [CpFe(CO)₂(CH₂)₄I] with Na[CpRu(CO)₂] and characterised by all the above mentioned …
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Characterization of lignin deposition in <i>Pinus taeda</i> L. cell suspension cultures
… pure (-)-matairesinol. Administrations of [1-¹³C], [2-¹³C ] and [3-¹³C ] specifically labeled phenylalanines to the <i>P. taeda</i> suspension cultures in medium containing NAA allowed the determination of lignin bonding patterns <i>in situ</i> by solid-state ¹³C NMR spectroscopy of the …
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The Chemistry of Some Triosmium Alkylidene and Alkylidyne Cluster Complexes
… by microanalysis and mass, IR, ('1)H and ('13)C NMR spectroscopy together with single-crystal X-ray diffraction analyses.
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High pressure carbon-13 NMR studies of dynamics in disordered systems
… high resolution $\sp1$H-decoupled $\sp{13}$C NMR spectroscopy is described. The design of an pulsed NMR spectrometer with increased sensitivity and versatility is presented and used in the design and development of a high pressure high resolution double-resonance NMR probe. This new technique …
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Toward the Synthesis of Trianionic Cerberus-Type N-Heterocyclic Carbenes and their Zwitterionic Gold and Silver Complexes
… by <sup>1</sup>H and <sup>13</sup>C NMR spectroscopy. The corresponding thione was obtained by addition of excess sulfur to the in situ generated carbene. The utility of the new carbene as ligand in organometallic chemistry has been proven by its incorporation into two new …
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Oxidation addition of H-H bonds to iridium: developing novel active water soluble catalysts for hydrogenation of unsaturates
… <b>(2)</b> was characterized by ¹H, ³¹p and ¹³C NMR spectroscopy, CH analysis and single crystal xray diffraction. <b>(2)</b> reacted with the strong sigma donor PMe₃ to form [IrH2(PMe₃)4]CI <b>(3b)</b> without having to remove the chloride ligand. <b>(2)</b> reacted with monosubstituted …
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Molecular structure and antibacterial function of hop resin materials
… techniques (UV, IR spectrometry; mass spectroscopy; 1 H-NMR f 13 C-NMR spectroscopy). The ability of these weak acids to ionise in solution was studied. The lack of agreement between pKa values measured using potentiometric, conductimetric, spectroscopic and solubility methods suggests …
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Synthesis of Resveratrol Esters and Aliphatic Acids.
… yield is 88%, and purity is above 95% based on NMR integration. Both <b>2</b> and <b>3</b> are good candidates for biological evaluation. <b>3</b> was used as a precursor in the synthesis of resveratrol aliphatic acid, 8-(3',5'-dihydroxylstilbene-4''-oxy)-3,6-dioxocotanoic acid <b>(9)</b>. …
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Part I: Design, synthesis, and studies of novel age-inhibitors and age-breakers; Part II: Novel synthetic methods for organofluorine compound
… activities have been studied by <sup>13</sup>C NMR, fluorescence, and UV-visible spectroscopy. We have demonstrated that these AGE-inhibitors and AGE-breakers were found to be more effective in their sequestration of AGE intermediates, such as dehydroascorbate (DHA) than the state-of-the art …
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Synthesis of Macrocyclic Polyamines and their Cu, Fe, Mn and Zn Complexes Targeting HIV (AIDS).
… by <super>1</super>H and <super>13</super>C NMR spectroscopy, and ESI mass spectrometry. Additionally, microanalysis (<bold>SH07</bold> and <bold>SH09</bold>) and HRMS (<bold>SH26</bold>) data were obtained. All metal complexes are characterized by ESI MS and microanalysis. Testing of some of …
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O-H activation in phosphates: oxidative addition to an iridium(I) center and reactivity of the resulting iridium(III) species
… and was characterized by infrared, ¹H, ³¹P, and ¹³C NMR spectroscopy and elemental analysis. The dibenzyl phosphate ligand is labile and is easily displaced by nucleophiles. The complex does not undergo reaction with molecular hydrogen at ambient temperatures. Dialkyl phosphate complexes were …
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The study of shear inactivation of dextransucrase preparation from Leuconostoc mesenteroides
… of the dextran precipitates was analyzed on ¹³C NMR spectroscopy at 90°C, it was found that there was no change in the polymer structure. But one of the spectra which corresponded to the dextransucrase preparation with the longest shear history contained resonance peaks of levan. All these …
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Nuclear magnetic resonance studies of dynamic cobalt and rhodium clusters in solution and in the solid state
… this exchange is slow at -80°C on the NMR time scale. The postulated mechanism for carbonyl exchange is based on a previously proposed mechanism, which is the expansion of the ligand icosahedron into a cubooctohedron. Because of the constraints imposed by the bisphosphine ligands, only …
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Lignin acrylate derivatives and their behaviors in free radical copolymerizations
… by elemental analysis, UV, IR, <sup>1</sup>H-NMR, and <sup>13</sup>C-NMR spectroscopy. The acrylated lignin model compounds, guaiacol-IEM urethane (GIU) and hydroxypropyl-guaiacol-IEM urethane (HPGIU), were copolymerized with methyl methacrylate (MMA) and styrene (St) through free radical …
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The synthesis and reactivity of binuclear μ-hydrocarbyl complexes of some transition metals
… characterized by microanalysis, infrared, ¹H and ¹³C nmr spectroscopy. The mass spectra of the compounds have been investigated and the fragmentation patterns are discussed and compared with other known polymethylene compounds. An extensive investigation into the reactivity of the new alkanediyl …
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The synthesis, structure and chemistry of some novel organometallic dendrimers
… solvents and were characterised by IR, ¹H and ¹³C NMR spectroscopy, mass spectrometry and microanalysis where possible. The organoruthenium dendrimers are significantly more stable at room temperature and in solution than all the iron analogues. The steric hindrance imparted by the cobaloxime …
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Structural characterisation and absolute stereochemistry of some degraded carotenoids from New Zealand honeys
… fully characterised by multidimensional ¹H and ¹³C NMR spectroscopy, and single-crystal X-ray crystallography, indicating the parent alcohol was 4,5-dihydro-1',5-dihydroxy-2',4,8',8'-tetramethylspiro[furan-2(3)H,7'[6']oxabicylco[3.2.1]oct[2']ene]-4'-one. Comparison of NMR-derived NOE and …
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