Structures and formation of \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm C}_{{\rm 4}} {\rm H}_{{\rm 8}} } \right]_{}^{_.^ + } $\end{document} ions

Nishishita, Takao; Bockhoff, Frank M.; McLafferty, Fred W.

doi:10.1002/oms.1210120106

Cited by 30 publications

(9 citation statements)

References 25 publications

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“…As reported earlier (8), normal NRMS spectra of 1butene, E-2-butene, and 2-methylpropene are quite similar, probably because most fragmentation occurs after reionization, effecting ionic isomerization that causes the close similarity of the electron ionization (EI) [28) and CAD [29) mass spectra of the C 4Hs isomers. Feng et a1.…”

Section: Isomeric Butenessupporting

confidence: 59%

Angle-resolved neutralization-reionization mass spectrometry

Fura

Tureček

McLafferty

1991

J. Am. Soc. Mass Spectrom.

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Neutralization -reionization mass spectra of 2-propenal, isomeric butenes, and isomeric n-hexenes have been found to depend significantly on the z-axis scattering angle of the neutralization event. As shown by Cooks for ion dissociations, increasing scattering angles generally favor products of higher activation-energy reactions. For isomeric butenes and n-hexenes, these reactions provide more definitive information for isomeric characterization.

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Section: Isomeric Butenessupporting

confidence: 59%

Angle-resolved neutralization-reionization mass spectrometry

Fura

Tureček

McLafferty

1991

J. Am. Soc. Mass Spectrom.

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“…Despite this evidence for isomerization of the [C,H,]+' molecular ions prior to fragmentation there is strong evidence that the ions formed near the ionization threshold retain their structural identity. [17][18][19] There have been fewer studies of the C5HI0 isomers. The metastable characteristics of [C,H,,]' ' isomers are very similar, consistent with thermochemical arguments that the critical energies for rearrangement are less than the critical energies for fragmentation;' in agreement with this interpretation the limited isotopic labelling experiments show extensive hydrogen interchange prior to fragmentation,20 although it is not known if skeletal isomerization also occurs.…”

Section: \3mentioning

confidence: 99%

Cyclopropane intermediates in the rearrangement and fragmentation of olefinic molecular ions

Laderoute

Harrison

1985

Org. Mass Spectrom.

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Methyl loss from deuterium-labelled molecular ions of 4-methyl-2-pentene, 2-methyl-2-pentene and 1,1,2-trimethylcyclopropane has been investigated for metastable molecular ions and for molecular ions formed by charge exchange with COS", XE" and CO". For metastable ion fragmentation reactions all three compounds exhibit very similar behavior and show specific and essentially equal loss of each of the original methyl groups as well as specific loss of a methyl where the hydrogens derive exclusively from the non-methyl hydrogens of the original molecules. The former results are interpreted in terms of interconversion of the three molecular ions through a ring-opened form of the trimethylcyclopropane molecular ion. The loss of the non-methyl hydrogens as CH, is interpreted in terms of isomerization to the 2,3-dimethyl-2-butene structure. With increasing internal energy direct allylic cleavage of the unrearranged methylpentene molecular ions increases in importance while the trimethylcyclopropane molecular ion shows an increased preference for loss of the C(2) methyl group. With increasing internal energy loss of the original non-methyl hydrogens as CH, decreases markedly in importance.

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“…1) Cž , interconvert prior to these processes: their collisioninduced dissociation spectra are very similar 16 and their breakdown graphs are identical at low energy.…”

Section: The C 2 Dmentioning

confidence: 96%

Insights into the C4H8+· potential energy surface: Fourier transform ion cyclotron resonance studies of ion-molecule reactions of D-labeled partners

et al. 1999

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Reactions of [ethylene]+· with ethylene and of [acetylene]+· with ethane were studied by Fourier transform ion cyclotron resonance spectrometry using labeled reactants. The results confirm and clarify the different steps of the mechanism proposed previously and elaborated with other methods. The [[acetylene]+·, ethane] system can either dissociate to give the ethyl cation product, or isomerize into [[ethylene]+·, ethylene]. The latter system can either dissociate to yield ionized ethylene or convert into ionized but‐2‐ene, which undergoes a complete H‐exchange prior to dissociation, leading to methyl radical, hydrogen radical and ethylene losses. The transfers of labeled atoms and the existence of H‐exchange prior to formation of the products were used as a probe to check the different steps of the mechanism. The influence of the initial energy of the system on the reaction pathway is discussed. Copyright © 1999 John Wiley & Sons, Ltd.

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Structures and formation of \documentclass{article}\pagestyle{empty}\begin{document}$ \left[{{\rm C}_{{\rm 4}} {\rm H}_{{\rm 8}} } \right]_{}^{_.^ + } $\end{document} ions

Cited by 30 publications

References 25 publications

Angle-resolved neutralization-reionization mass spectrometry

Angle-resolved neutralization-reionization mass spectrometry

Cyclopropane intermediates in the rearrangement and fragmentation of olefinic molecular ions

Insights into the C4H8+· potential energy surface: Fourier transform ion cyclotron resonance studies of ion-molecule reactions of D-labeled partners

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