Skeletal rearrangement reactions in sulphides, disulphides, sulphoxides and sulphones upon electron impact

1965 ◽  
Vol 6 (49) ◽  
pp. 4377-4380 ◽  
Author(s):  
J.Ø. Madsen ◽  
C. Nolde ◽  
S.-O. Lawesson ◽  
G. Schroll ◽  
J.H. Bowie ◽  
...  
Keyword(s):  
Electron Impact ◽  
Skeletal Rearrangement ◽  
Rearrangement Reactions

Electron impact studies CX—+E spectra from negative ions.Ortho effects and skeletal rearrangement reactions from sulphur compounds

1977 ◽  
Vol 12 (4) ◽  
pp. 191-195 ◽  
Author(s):  
J. H. Bowie ◽  
P. Y. White ◽  
J. C. Wilson ◽  
F. C. V. Larsson ◽  
S.-O. Lawesson ◽  
...  
Keyword(s):  
Electron Impact ◽  
Skeletal Rearrangement ◽  
Sulphur Compounds ◽  
Impact Studies ◽  
Rearrangement Reactions

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.

Stereospecific skeletal rearrangement reactions in bridgehead-substituted bicyclo[2.2.2] systems under neutral conditions

1987 ◽  
Vol 52 (12) ◽  
pp. 2509-2517 ◽  
Author(s):  
Duy H. Hua ◽  
Wei Yi Gung ◽  
Robert A. Ostrander ◽  
Fusao Takusagawa
Keyword(s):  
Skeletal Rearrangement ◽  
Rearrangement Reactions ◽  
Neutral Conditions

Electron impact studies. XXXII. Negative-ion mass spectra of aromatic compounds containing the =N-O- substituent

1968 ◽  
Vol 21 (8) ◽  
pp. 2031 ◽  
Author(s):  
JH Bowie ◽  
SO Lawesson ◽  
BS Larse ◽  
GE Lewis ◽  
G Schroll
Keyword(s):  
Electron Impact ◽  
Aromatic Compounds ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Negative Ion ◽  
Skeletal Rearrangement ◽  
Marked Contrast ◽  
Azoxy Compounds ◽  
Positive Ion ◽  
Fragmentation Processes

The negative-ion mass spectra of aromatic azoxy compounds, nitrones, and N-oxides exhibit pronounced molecular ions and simple fragmentation processes. No skeletal-rearrangement fragments are produced upon electron impact, in marked contrast to those exhibited in the positive-ion spectra of these compounds.

Rearrangement Reactions in the Electron Impact Fragmentation of Isobutene

1974 ◽  
Vol 52 (9) ◽  
pp. 1813-1820 ◽  
Author(s):  
Margaret S.-H. Lin ◽  
Alex. G. Harrison
Keyword(s):  
Mass Spectrum ◽  
Internal Energy ◽  
Electron Impact ◽  
Electron Energy ◽  
Skeletal Isomerization ◽  
Molecular Ion ◽  
Impact Fragmentation ◽  
Rearrangement Reactions ◽  
Average Internal Energy

The detailed mass spectrum of isobutene has been examined using both D and 13C labelling. It is shown that at low average internal energies of the molecular ion complete randomization of hydrogens and of carbons occurs prior to fragmentation to form C3H5+. As the average internal energy of the molecular ion increases (by increasing the ionizing electron energy) the extent of both carbon and hydrogen randomization decreases. Carbon scrambling is complete in the molecular ion prior to fragmentation to form C2 ions under all conditions studied. The results are consistent with a skeletal isomerization of the isobutene molecular ion by a mechanism involving a series of 1,3 ring closures to form methylcyclopropane type ions.

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