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- Gogoll, Adolf, et al.
(författare)
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Chemical shift assignment of geminal protons in 3,7-diazabicyclo [3.3.1]nonanes : An unexpected deviation from the axial/equatorial chemical shift order
- 1997
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Ingår i: Magnetic Resonance in Chemistry. - : John Wiley & Sons. - 0749-1581 .- 1097-458X. ; 35:1, s. 13-20
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Tidskriftsartikel (refereegranskat)abstract
- The chemical shift order of axial and equatorial methylene protons in 1,5-disubstituted 3,7-diazabicyclo[3.3.1]nonan-9-ones may be altered by substituents in the 1,5-positions, but the corresponding alcohols behave differently. Unambiguous signal assignments for a series of the title compounds are provided, based on 3JCH coupling constants and on {1H} 13C heteronuclear Overhauser effects. Substituent anisotropy effects as a source of the chemical shift changes are discussed.
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| 2. |
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| 3. |
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| 4. |
- Maltseva, TV, et al.
(författare)
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T-1 and T-2 relaxations of the C-13 nuclei of deuterium-labeled nucleosides
- 1998
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Ingår i: MAGNETIC RESONANCE IN CHEMISTRY. - : JOHN WILEY & SONS LTD. - 0749-1581. ; 36:4, s. 227-239
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The effect of H-2 on C-13 longitudinal (T-1) and transverse (T-2) relaxation parameters was determined for the first time for diastereospecifically deuterium-labeled nucleosides, which are used as the building blocks for non-uniform isotope labeling for t
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| 6. |
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| 7. |
- Szabó, Zoltan, Associate professor, et al.
(författare)
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Application of 19F NMR spectroscopy to the study of equilibrium dynamics of uranyl(2+)‐fluoride complexes
- 1995
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Ingår i: Magnetic Resonance in Chemistry. - : Wiley. - 0749-1581 .- 1097-458X. ; 33:1, s. 20-26
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Tidskriftsartikel (refereegranskat)abstract
- One‐ and two‐dimensional magnetization‐transfer 19F NMR methods were applied in a quantitative study of the fluoride exchange for uranyl(2+)‐fluoride complexes in aqueous solution. The applicability of these techniques and the classical lineshape analysis is discussed, and the quality of the results (rate constants and relaxation rates) obtained by the three methods is compared.
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| 8. |
- Szabó, Zoltan, Associate professor, et al.
(författare)
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Conformational studies on B/C‐cis‐ and B/C‐trans‐morphinan derivatives
- 1995
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Ingår i: Magnetic Resonance in Chemistry. - : Wiley. - 0749-1581 .- 1097-458X. ; 33:11, s. 913-916
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Tidskriftsartikel (refereegranskat)abstract
- An unambiguous structural differentiation of B/C‐cis‐ and B/C‐trans‐morphinan derivatives (thebainone‐A and β‐thebainone‐A and their 7,8‐dihydro derivatives) is provided. The structures were confirmed by NOE difference spectroscopy and selective 2D J‐INEPT experiments. In addition, full a priori 1H and 13C NMR assignments of the isomeric pairs studied are presented.
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