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  • Analytical Chemistry and Spectroscopy  (17)
  • 2015-2019
  • 1970-1974  (17)
  • 1
    Electronic Resource
    Electronic Resource
    Electron-impact fragmentation of the bicyclo[4.1.0]heptane-2-one system: Correlations with photochemistry (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 1-11 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The low resolution and complete high resolution mass spectra of a series of methyl and deuterium substituted bicyclo[4.1.0]heptane-2-one derivatives have been measured. An attempt has been made to test the operation of a fragmentation process analogous to the known photochemical rearrangement, and to determine if the substitution effects critical to the photorearrangement also influence the electron-impact process. The fragmentation pattern of these conjugated cyclopropyl ketones is detailed and the influence of the cyclopropyl ring is discussed. It is suggested that electron-impact-induced rearrangements which are analogous to photochemical transformations will be relatively low energy processes and will remain prominent at low ionizing voltages.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030102
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  • 2
    Electronic Resource
    Electronic Resource
    The mass spectra of some methyl alkanesulphinates (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1974), S. 409-412 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass Spectra of the methyl esters of ethane, n-propane, isopropane, n-butane, sec-butane and tert-butane sulphinic acids have been determined. In general, the parent ions are of low abundance and the most prevalent are the hydrocarbon ions which arise by α-cleavage. Other ions that serve to characterise these compounds are those from the CH4SO2 and HSO2 fragments.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210080144
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  • 3
    Electronic Resource
    Electronic Resource
    Intramolecular isotopic order in biologically produced acetic acid (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 172-174 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acetic acid isolated from cider vinegar and inorganically synthesized glacial acetic acid have markedly different intramolecular isotopic distributions of the stable carbon isotopes. Carbon-12 is concentrated in the methyl group relative to the carboxyl group in the biologically produced acid. The reverse distribution is observed in the particular sample of glacial acetic acid examined here.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010306
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  • 4
    Electronic Resource
    Electronic Resource
    Intramolecular carbon isotopic distribution in biologically produced acetoin (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 415-417 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The concentrations of carbon-13 in the individual carbon atoms of 3-hydroxy-2-butanone (acetoin) from apple cider vinegar decrease with decreasing oxidation level in the sequence .Because the distributions of isotopes within biological compounds are controlled by kinetic and equilibrium effects, intramolecular isotopic analyses may provide a means of defining the equilibria between metabolic pathways and of recognizing the molecular remnants of pre-existent organisms in geological samples.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010609
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon isotopic fractionations associated with acetic acid production by Acetobacter suboxydans (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1974), S. 412-414 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acetobacter suboxydans, strain 8.3, was grown using ethanol, made by the hydration of ethylene, as the sole energy source. After the microorganism had oxidized some of the ethanol to acetic acid, the unassimilated alcohol and produced acetic acid were isolated from the supernatant. Carbon isotopic analyses of these compounds and the starting ethanol show: (1) the methyl carbon of the starting alcohol is enriched in carbon-13 by 4.6% relative to the hydroxyl carbon, (2) the starting alcohol contains 2% less carbon-13 than the unassimilated ethanol and (3) the carboxyl carbon of the acetic acid excreted by the A. suboxydans is enriched by 3.8% in carbon-13 relative to the methyl carbon. These results support earlier findings which indicate that organisms preferentially utilize compounds enriched in carbon-12 and tend to concentrate carbon-12 in the reduced carbons relative to the oxidized carbons of metabolic products.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200010608
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  • 6
    Electronic Resource
    Electronic Resource
    Mass spectrometry in structural and stereochemical problems - CLXXXIV:For paper CLXXXIV see R. J. Liedtke and C. Djerassi, J. Am. Chem. Soc. 91, 6814 (1969). Charge localization in fragment ions of amino ketones and esters (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 439-453 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectral fragmentation of a number of specially synthesized amino esters and ketones has been studied in which the distance between the two functionalities has been varied. The principal fragments formed following initial ionization are the even-electron immonium ions a and b. Further fragmentation of ion a in the amino esters occurs via non-specific processes. Therefore it is difficult to establish the degree of mobility of the positive charge in the fragment ions, notably whether the species with the charge present on the oxygen atom makes a significant contribution to the fragmentation. The β-(IIb) and γ-(IV) amino ketones show no McLafferty rearrangements after α-fission, thus demonstrating that uncoupling of the carbonyl π electrons is not a feasible trigger in lieu of charge localization.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030404
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  • 7
    Electronic Resource
    Electronic Resource
    A conversational mass spectral search and retrieval system - II: Combined search options (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 107-115 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An interactive, conversational mass spectral search system based on 8782 uncertified electron-impact mass spectra and accessible over ordinary telephone lines, is described. Compounds whose mass spectra are in the file can be immediately identified and very useful structural inferences can be obtained for compounds that are not represented in the file. The file may be searched in a number of ways, including by peaks and intensities, molecular weight, complete and partial molecular formula, molecular weight plus peaks/intensities, molecular formula plus peaks/intensities and molecular weight plus molecular formula. Lastly, the complete spectrum of any compound in the file can be printed out.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210070116
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  • 8
    Electronic Resource
    Electronic Resource
    Kβ/Kα intensity ratios for elements of atomic number 20 to 30 (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 3 (1974), S. 149-150 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Twenty-five new measurements of Kβ/Kα X-ray intensity ratios for elements in the atomic number range 20 to 30 confirm other recent evidence that the variation with atomic number in this region is much less than previously thought, but there is still some disagreement for atomic numbers above 27. A table of recommended values is given.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300030405
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  • 9
    Electronic Resource
    Electronic Resource
    The 13C NMR spectra and structure of 2,1,3-benzoxadiazole,-benzothiadiazole and -benzoselenadiazole (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 430-432 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR chemical shifts and one-bond carbon-hydrogen coupling constants have been obtained for the title compounds in carbon disulphide as solvent. There appears to be little solvent effect on the 13C chemical shifts. The results suggest the order of release of electrons into the ring is O ≫ S 〉 Se.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270060806
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  • 10
    Electronic Resource
    Electronic Resource
    Carbon-13 NMR spectra of monosubstituted pyrazinesTaken in part from the PhD Thesis of C. J. Turner, submitted to the University of London, 1974. (1974)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 6 (1974), S. 663-666 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbon-13 NMR chemical shifts and one-bond carbon-hydrogen coupling constants have been obtained at 15·09 MHz. The trends in the carbon chemical shifts obtained for the pyrazines parallel those of monosubstituted benzenes and 2-substituted pyridines, except for the direct effect of substitution where the pyrazines resemble pyridines not benzenes. The substituent effects on the 13C NMR spectra are generally quite similar to those in the 1H NMR spectra. The 13C NMR spectrum of the tautomeric hydroxypyrazine has been compared with the 13C NMR spectra of 2-, 3- and 4-hydroxypyridines. Hydroxy compounds that can exist as a cyclic amide show a large meta substituent effect on the chemical carbon shift.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270061212
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