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  • 1985-1989
  • 1980-1984
  • 1965-1969  (106)
  • 1920-1924
  • 1968  (106)
  • Analytical Chemistry and Spectroscopy  (92)
  • Psychopharmacology  (14)
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Material
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  • 1985-1989
  • 1980-1984
  • 1965-1969  (106)
  • 1920-1924
Year
Keywords
  • 101
    Electronic Resource
    Electronic Resource
    Amino-acid sequence study in peptides by mass spectometry-IIFor Part I see Ref. 3.. Investigation of pentadeuterobenzoyl-peptide methyl esters (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 345-350 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The utility of benzoyl and pentadeuterobenzoyl derivatives of peptide methyl esters for mass spectrometric analysis was investigated. The mass spectra of the glu-his and the val-tyr-pro derivatives are discussed. Treatment of the peptide methyl esters with the mixed benzoic-ethyl-carbonic anhydride did in some cases lead to benzoyl derivatives as well as to ethoxycarbonyl derivatives.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010304
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    Paper (German National Licenses)
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  • 102
    Electronic Resource
    Electronic Resource
    Amino-acid sequence study in peptides by mass spectometry - IIIIn Part II see preceding paper. Investigation of ethyoxycarbonyl-peptide methyl esters (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 351-364 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The utility of ethoxycarbonyl-peptide methyl esters for mass spectrometric analysis is described. The ethoxycarbonyl group has important advantages over other protecting groups which are in use. The derivatives have high intensity; this greatly facilitates the interpretation of the fragmentation pattern. The spentra of the methyl esters of the ethoxycarbonyl derivatives of pro-val, trp-gly, gly-ser, (cys)2, glutation (GSH), glu-his-phe, val-tyr-pro and val-lys-val-tyr-pro are given.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010305
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    Paper (German National Licenses)
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  • 103
    Electronic Resource
    Electronic Resource
    Gas chromatographic - mass spectrometric studies of long chain hydroxy acids. - III.1 The mass spectra of the methyl esters trimethylsilyl ethers of aliphatic hydroxy acids. A facile method of double bond location (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 593-611 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trimethylsilylation has proved to be extremely useful in the gas chromatography and the mass spectrometry of hydroxy acid methyl esters. The characteristic mass spectral fragmentation patterns have shown these derivatives to be superior in some respects to others for structural elucidation; in particular, hydroxylation followed by trimethylsilylation provides a useful method of double bond location in unsaturated fatty acid esters.A preliminary presentation of this method has been given by G. Eglinton at the Lecture etting in Combined Gas Chromatography - Mass Spectrometry at the school of Pharmacy, London, August 9, 1967. It has come to the authors' attention that this method simultaneously developed by Dr. P. Capella, Institute di Industria Agrarie, University of Bologna, Italy1c (P. Capella and C. M. Zorzut, Anal. Chem. 41, 1458 (1968).)
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010413
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    Paper (German National Licenses)
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  • 104
    Electronic Resource
    Electronic Resource
    On the mass spectra of some alkyl digermanium compounds (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 647-657 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper reports the monoisotopic mass spectra of the compounds (CH3)Ge—Ge(CH3)3,(C2H5)3Ge—Ge(C2H5)3 and (CH3)3Ge—Ge(C2H5)3. With the aid of metastable ion transitons and appearance potentials the fragmentation patterns can be given.The dominant reactions are explained in terms of the valence of the metal atom. According to the valence rule the possibility of forming an ion in which two germanium atoms are bonded to five other groups (alkyl or hydrogen) determines greatly the spectra, while successive elimination of the methyl groups appears to be difficult and elimination of the ethyl groups is a predominant process.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010506
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    Paper (German National Licenses)
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  • 105
    Electronic Resource
    Electronic Resource
    Stereoisomeric effects on mass spectra - I. A Review (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 659-667 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The unimolecular reactions that give rise to mass spectra are controlled by spatial relationships and energy considerations. In molecules that contain a heteroatom, elimination reactions, involving bond-making as well as breaking, are often prominent, e.g. loss of water from alcohols. The ease of such reactions depends on spatial relationships in the molecule, and the resultant ion intensities in the spectra of geometric isomers can consequently be correlated with differences in geometry and hence furnish a basis for assigning structures. Processes that do not involve bond-making do not have such rigorous geometric requirements, but depend rather on attainment of a transition state defined in terms of a minimum energy content. Common product ions from stereoisomeric hydrocarbons seem often to arise via a common transition state. When this condition holds, the difference between the enthalpies of the isomers is reflected in the relative appearance potentials and-though the cause-and-effect relationship here is less direct and more readily obscured by other factors-relative intensities of the common product derived from the isomers. In both classes of processes, the spectra of stereoisomers can be simplified and made more distinctive by lowering source temperature and ionizing voltage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010507
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    Paper (German National Licenses)
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  • 106
    Electronic Resource
    Electronic Resource
    Electron-impact studies of organometallic molecules - VII.For Part VI, see Ref. 1. Some transition metal complexes derived from 3,3,3-trifluoroprop-1-yne (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 687-702 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of ten complexes derived from 3,3,3-trifluoroprop-1-yne, namely (CF3C≡CH)CO2(CO)6, (CF3C≡CH) [π—C5H5Ni]2, (CF3C≡CH)3Co2(CO)4, CF3CH2C[Co(CO)3]3, are discussed in terms of their structures. The major processes observed can be satisfactorily explained in terms of (i) loss of carbonyl groups, if present; (ii) loss of one fluorine atom from the parention (iii) elimination of neutral metal fluorides, with ligand transfer reactions in the case of the iron complexes; (iv) elimination of neutral fluorocarbon molecules.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010509
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