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  • Analytical Chemistry and Spectroscopy  (346)
  • 1970-1974  (346)
  • 1970  (346)
Collection
Keywords
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Years
  • 1970-1974  (346)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Fragmentations de Molecules Aliphatiques Bifonctionnelles: Methoxyesters (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 399-401 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some of the observed fragmentation reactions of long-chain aliphatic methoxyesters necessitate the interaction of both functional groups, even when these are located far apart: both alcohol eliminations from the ion formed by α-cleavage to the ether function which contains the ester group are highly specific: they involve a hydrogen atom in the position adjacent to the methoxyl-bearing carbon.
    Notes: Certaines des fragmentations des méthoxyesters aliphatiques à longue chaíne nécessitent l'interation des deux fonctions: les deux éliminations d'alcool que subit l'ion par rupture en α de la fanction éther et comprenant le groupe ester, sont trés spécifiques: elles mettent en cause un atome d'hydrogéne en position adjacente au carbone qui porte le groupe méthoxyle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030315
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  • 2
    Electronic Resource
    Electronic Resource
    Addendum (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. i 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030321
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  • 3
    Electronic Resource
    Electronic Resource
    The ion kinetic energy spectra of some aromatic hydrocarbons (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 455-477 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The technique of ion kinetic energy spectroscopy has been applied to the study of the aromatic hydrocarbons benzene, toluene, naphthalene, 2-methyl naphthalene, biphenyl and anthracene. The method is illustrated by a complete study of naphthalene in which transitions of metastable doubly- and singly-charged ions are listed, including reactions in which singly-charged ions are formed by collision induced charge-exchange reactions of doubly-charged ions and by the double process of charge-exchange and metastable decomposition with loss of one or two hydrogen atoms. Decompositions of doubly-charged ions into two singly-charged ions, together with the kinetic energies released in these decompositions, are also given for all the compounds studied.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030405
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  • 4
    Electronic Resource
    Electronic Resource
    Mass spectrometry of aralkyl compounds with a functional group - VIII: Comparison of the breakdown of 3-phenylnitropropane with that of 3-phenylpropyl nitrite upon electron-impactPart of the thesis of N. M. M. Nibbering. (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 487-506 
    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 3-phenylnitropropane and of its analogues, specifically deuterated in the aliphatic chain and in the phenyl ring, show that the molecular ion loses a molecule of water in two different modes, viz. either with both α-hydrogen atoms or with a γ- and an ortho-hydrogen atom. Moreover, a molecule of nitric oxide is eliminated from the molecular ion and the resulting [M - NO]+-ion appears to decompose further in many complicated ways. This loss of nitric oxide does not arise from an isomerization of the nitro group to a nitrite group, because the [M - NO]+-ion of 3-phenylpropyl nitrite breaks down in an altogether different manner than that of 3-phenylnitropropane. This is demonstrated by the spectra of specifically deuterated analogues of 3-phenylpropyl nitrite.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030407
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  • 5
    Electronic Resource
    Electronic Resource
    Mass spectra of maleimides, isomaleimides, bis-maleimides, bis-isomaleimides and the intramolecular photocyclization products of bis-maleimides (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 507-517 
    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 some maleimides, isomaleimides, bis-maleimides, bis-isomaleimides and diazatetracyclotetraones (intramolecular photocyclization products of bis-maleimides) have been investigated. The elimination of carbon dioxide from the molecular ions of these compounds is not generally an important process. Fragment ions arising from the transfer of one or more hydrogen atoms from the eliminated to the charge retaining moiety (and vice versa) are prevalent and the variation in fragment ion intensity with changes in structure is consistent with the mechanisms of the analogous fragmentations of succinimides established by Djerassi's group. The apparently unusual fragmentations of the diazatetracyclotetraones may be rationalized on the basis that the molecular ion consists of three or more different species.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030408
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  • 6
    Electronic Resource
    Electronic Resource
    The high-resolution mass spectra of aliphatic aldehydes (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 549-555 
    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 the C3 to C9 n-alkanals and a number of branched aldehydes have been obtained at a resolution sufficient to resolve the O—CH4 doublets. From the resolved spectra, a study of metastable transitions, and the spectrum of one deuterium-labelled alkanal, (n-hexanal-2,2-d2) the major fragmentation reactions have been elucidated. Of particular interest are the γ-cleavage reaction, leading to [C3H5O]+ in the n-alkanals, which proceeds both by a simple cleavage and by cleavage preceded by hydrogen interchange, and the loss of C2H4, which involves loss of the C2 and, probably C3, carbons.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030504
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  • 7
    Electronic Resource
    Electronic Resource
    Mass spectrometry of aralkyl compounds with a functional group - IX:For Part VIII, see Ref. 1. Hydrogen scrambling in the molecular ion of hydrocinnamaldehyde (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 583-595 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecular ion of hydrocinnamaldehyde (C6H5CH2CH2CHO) chiefly loses fragments C2H2O and C3H4O. Mass spectra of specifically deuterated analogues show that in the loss of C2H2O an α-hydrogen atom (with respect to the aldehyde group) is transferred to the aromatic part. A shift of the aldehydic hydrogen to one of the ortho positions of the phenyl ring and loss of C2H2O by a McLafferty rearrangement is not observed.In the loss of C3H4O also an α-hydrogen atom migrates to the aromatic part. Both reactions appear to occur with an extensive randomization of all hydrogen atoms in the molecular ion.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030507
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  • 8
    Electronic Resource
    Electronic Resource
    The mass spectra of meliacins and related compounds - II:For Part I, see reference 1. Meliacins lacking the ring d epoxide function (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 321-331 
    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 some 14,15-deoxymeliacins are reported and discussed in relation to the previously published fragmentation patterns of the epoxymeliacins. The fragmentation patterns of a few compounds with structures closely related to those proposed for the principal ions in the spectra of the epoxymeliacins are also examined.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030307
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  • 9
    Electronic Resource
    Electronic Resource
    Four-centred rearrangements in the mass spectra of aliphatic ethersThe work reported here constitutes part of the MSc Thesis of C. W. Tsang, University of Toronto, 1968. (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 647-655 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The [CH3O=CHCH3]+ ions observed in the mass spectra of ethers of formula CH3OCH (CH3)R(R = H or alkyl) undergo two rearrangement fragmentation reactions to form [C2H5]+ and [CH2OH]+. The scope of the rearrangements has been investigated and it is shown that enlargement of the alkyl group on either side of the ether linkage leads to alternative fragmentation routes. From a study of metastable intensities it is concluded that the fragmentations probably occur directly from the [CH3O=CHCH3]+ structure through four centred rearrangements rather than through the intermediacy of the [C2H5O=CH2]+ ion.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030512
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  • 10
    Electronic Resource
    Electronic Resource
    The decomposition of a triply-charged metastable positive ion of biphenyl (1970)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 661-668 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The transition, [C12H10]+3→[C11H7]+2 + [CH3]+, has been detected both in the ion kinetic energy spectrum and in the mass spectrum of biphenyl. The width of a resulting ‘metastable peak’ has been measured by setting the magnetic field to accept [C11H7]+2 ions and scanning the high voltage at fixed electric sector voltage. The kinetic energy released in the decomposition, calculated from the peak width, amounted to 4.5 eV. With the assumption that this energy release is due entirely to charge separation, the charge distribution in [C12H10]+3 is discussed. The derivation of the equations used to calculate the energy released is given in the Appendix.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210030514
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