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  • 1
    Digitale Medien
    Digitale Medien
    Chemical shift non-equivalence of ring protons in N-substituted β-lactams (1970)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 307-310 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A study is reported on the chemical shift non-equivalence of the diastereotopic protons at C-4 in identically 3,3-disubstituted β-lactams having an asymmetric carbon atom in positions ranging from β to ε of the chain attached to the nitrogen atom. The non-equivalence has been correlated with the nature of the substituents bonded to the chiral centre and to its distance from the C-4 protons.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270020311
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  • 2
    Digitale Medien
    Digitale Medien
    Stereochemical effects in the electron impact mass spectra of some 2,6-dideoxy-3-c-methylhexopyranosesPresented in preliminary form at the ‘VII International Symposium on Carbohydrate Chemistry’, Bratislava, Czechoslovakia, 5th-9th August 1974. (1976)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 71-78 
    Details
    ISSN: 0030-493X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The electron impact mass spectra of the methyl α-and β-glycosides of axenose, of a number of derivatives, and of mycarose, display substantial differences, characteristic of their stereochemistry. In order to interpret this behaviour the structures of the fragments and the main features of the fragmentation patterns have been established, and the methyl glycosides of some related monosaccharides (arcanose, cladinose and idose) have been examined. The experimental results allow the observed differences to be attributed to the presence of an intramolecular hydrogen bond between the hydroxyl group at C-3 and the oxygen atom of the methoxy group in the methyl α-glycosides of axenose and mycarose.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/oms.1210110110
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  • 3
    Digitale Medien
    Digitale Medien
    Chemical shift non-equivalence of methylene protons adjacent to an asymmetric nitrogen atom (1971)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 3 (1971), S. 249-253 
    Details
    ISSN: 0030-4921
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The chemical shift non-equivalence of the methylene protons adjacent to the quaternary nitrogen in compounds of the type has been investigated. The behaviour of the examined compounds is interpreted in terms of different rotation rates around the three C—N⊕ bonds. The vicinal and geminal coupling constants of the non-equivalent methylene protons are also reported and discussed in terms of steric factors.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/mrc.1270030210
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Field desorption mass spectrometry of anthracyclines comparison with other soft ionization techniques (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 35-40 
    Details
    ISSN: 0306-042X
    Schlagwort(e): Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Field desorption mass spectral data relative to 38 anthracycline derivatives are presented. A molecular ion, or [MH]+ ion is always present; in most cases it is the base peak in the spectrum at the best anode temperature. Increase in the emitter temperature promotes fragmentation which gives useful structural information. A comparison has been made between field desorption and other soft ionization techniques such as fast atom bombardment, desorption chemical ionization and a liquid chromatographic mass spectrometric interface with direct liquid introduction into a chemical ionization ion source. The most significant results were obtained by using positive and negative ion fast atom bombardment and direct liquid introduction with negative ion detection.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bms.1200110107
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