Detector for the Metastable Ions Observed in the Mass Spectra of Organic Compounds

1968 ◽  
Vol 39 (8) ◽  
pp. 1163-1167 ◽  
Author(s):  
N. R. Daly ◽  
A. McCormick ◽  
R. E. Powell
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Metastable Ions

Electron impact studies. VI. Mass spectra of esters and thioesters. Skeletal rearrangement on electron impact

1967 ◽  
Vol 20 (4) ◽  
pp. 689 ◽  
Author(s):  
JH Bowie ◽  
RG Cooks ◽  
P Jakobsen ◽  
S Lawesson ◽  
G Schroll
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
High Resolution ◽  
Electron Impact ◽  
Mass Spectra ◽  
Skeletal Rearrangement ◽  
Unsaturated Esters ◽  
Impact Studies ◽  
Unsaturated Alcohols ◽  
Metastable Ions

The mass spectra of representative series of simple alkyl acetoacetates, alkyl acetothioacetates, and some unsaturated esters derived from unsaturated alcohols or phenols are reported and discussed. The fragmentation schemes have been established by high resolution measurements, appropriate metastable ions, and by deuterium and 18O labelling. Many of the spectra show significant skeletal rearrangement fragments arising from either loss of carbon monoxide or carbon dioxide.

Approach for structural interpretation of laser microprobe mass spectra of organic compounds

1985 ◽  
Vol 57 (14) ◽  
pp. 2944-2951 ◽  
Author(s):  
Luc. Van Vaeck ◽  
Jan. Claereboudt ◽  
Johan. De Waele ◽  
Eddy. Esmans ◽  
Renaat. Gijbels
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Structural Interpretation ◽  
Laser Microprobe ◽  
Laser Microprobe Mass

Squaraine chemistry. On the anomalous mass spectra of bis(4-dimethylaminophenyl)squaraine and its derivatives

1986 ◽  
Vol 64 (8) ◽  
pp. 1607-1619 ◽  
Author(s):  
Kock-Yee Law ◽  
F. Court Bailey ◽  
Lynn J. Bluett
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Mass Number ◽  
Equal Mass ◽  
Transfer Reactions ◽  
Ionization Mass ◽  
Structure Property ◽  
Fragment Ions ◽  
Structure Property Relationship ◽  
Metastable Ions

The electron impact (EI) mass specra of bis(4-dimethylaminophenyl)squaraine 1 and its derivatives 2–14 have been studied. Ions of mass number higher than the molecular ion, which are shown to be precursors of fragment ions of lower mass numbers, are observed. From the structure–property relationship, these ions are assigned to [Formula: see text] and [Formula: see text] where CH2R is the alkyl group in the N,N-dialkylanilino moiety of squaraine. Evidence is provided that the formation of [Formula: see text] and [Formula: see text] is the result of alkyl transfer and H transfer reactions within a squaraine aggregate rather than intermolecular vapor phase reactions in the mass spectrometer. This molecular aggregate is later shown to be a trimer by analysis of metastable ion data and chemical ionization mass spectrometry. The fragmentation sequence of this trimeric species is elucidated with the assistance of metastable ions. Results show that the trimer may break down to monomelic and dimeric species upon electron impact; alternatively, the four-membered ring of the central squaraine in the trimer may cleave to generate two species of approximately equal mass number. These two species usually dominate the mass spectrum and further fragment into [Formula: see text] and [Formula: see text] Detailed fragmentation schemes for [Formula: see text] and [Formula: see text] are proposed and discussed.

Some Specific Molecular Rearrangements in the Mass Spectra of Organic Compounds

1959 ◽  
Vol 63 (11) ◽  
pp. 1861-1868 ◽  
Author(s):  
J. H. Beynon ◽  
G. R. Lester ◽  
A. E. Williams
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Molecular Rearrangements

Complexes of bivalent metal cations in electrospray mass spectra of common organic compounds

2002 ◽  
Vol 37 (6) ◽  
pp. 617-622 ◽  
Author(s):  
Tomasz Bie?kowski ◽  
Agnieszka Brodzik-Bie?kowska ◽  
Witold Danikiewicz
Keyword(s):  
Organic Compounds ◽  
Mass Spectra ◽  
Metal Cations ◽  
Bivalent Metal
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