AN ELECTRON IMPACT STUDY OF METHYL PHENYL ETHERS

1964 ◽  
Vol 42 (8) ◽  
pp. 2008-2017 ◽  
Author(s):  
F. Meyer ◽  
A. G. Harrison
Keyword(s):  
Electron Impact ◽  
Methyl Ether ◽  
Mass Spectra ◽  
Impact Study ◽  
Deuterium Labelling ◽  
Appearance Potential ◽  
Phenyl Ethers ◽  
Methyl Phenyl

The mass spectra of anisole, anisole-methoxy-d3, meta and para methylanisole, meta and para methyl-d3-anisole, and meta and para niethylanisole-methoxy-d3 have been recorded. From the deuterium labelling and appearance potential studies, the main fragmentation paths on electron impact have been elucidated. The energetics of formation of the CH3OC7H6+ ion from the methylanisoles, benzyl methyl ether, 7-methoxycycloheptatriene, and the ethylanisoles have been studied.

AN ELECTRON IMPACT STUDY OF SOME C8HI0 ISOMERS

1965 ◽  
Vol 43 (1) ◽  
pp. 211-218 ◽  
Author(s):  
F. Meyer ◽  
P. Haynes ◽  
Stewart McLean ◽  
A. G. Harrison
Keyword(s):  
Mass Spectrum ◽  
Electron Impact ◽  
Mass Spectra ◽  
Major Part ◽  
The Other ◽  
Fragmentation Pattern ◽  
Impact Study ◽  
Deuterium Labelling ◽  
Appearance Potential ◽  
Alkyl Benzenes

The mass spectra of 1-, 2-, and 6-methylspiro[2.4]hepta-1,3-diene have been measured and found to be very similar to the spectra of 7-methylcycloheptatriene and the isomeric alkyl benzenes. It is concluded that in all cases the major part of the fragmentation occurs by identical paths involving identical intermediates. This conclusion is supported by deuterium labelling and appearance potential data. On the other hand the mass spectrum of 2,5-dimethyl-1,5-hexadien-3-yne, an acyclic C8H10 isomer, shows a number of significant differences in its fragmentation pattern. These differences are reflected in the energetics of ion formation and it is concluded that in this case the fragmentation proceeds through different intermediates.

IONIZATION AND DISSOCIATION OF FORMATE ESTERS BY ELECTRON IMPACT

1963 ◽  
Vol 41 (8) ◽  
pp. 2054-2059 ◽  
Author(s):  
D. Van Raalte ◽  
A. G. Harrison
Keyword(s):  
Formic Acid ◽  
Electron Impact ◽  
Proton Affinity ◽  
Mass Spectra ◽  
Methyl Formate ◽  
Ethyl Formate ◽  
Kcal Mole ◽  
Deuterium Labelling ◽  
Appearance Potential

The mass spectra of methyl formate-d, ethyl formate-d, and isopropyl formate-d are compared with the mass spectra of the undeuterated compounds. By use of the deuterium labelling and appearance potential studies the dissociation reactions leading to a number of the oxygen-containing ions have been elucidated. The proton affinity of formic acid is estimated to be 157 kcal/mole from the appearance potential of the HC(OH)2+ ion in the mass spectra of ethyl formate and isopropyl formate.

Mass spectra of new heterocycles: XVI. Electron impact study of alkyl 5-aminothiophene-2-carboxylates

2017 ◽  
Vol 53 (6) ◽  
pp. 913-919 ◽  
Author(s):  
L. V. Klyba ◽  
N. A. Nedolya ◽  
E. R. Sanzheeva ◽  
O. A. Tarasova
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Impact Study

ENERGETICS AND MECHANISM OF HYDRONIUM ION FORMATION BY ELECTRON IMPACT

1963 ◽  
Vol 41 (12) ◽  
pp. 3118-3126 ◽  
Author(s):  
D. Van Raalte ◽  
A. G. Harrison
Keyword(s):  
Water Molecule ◽  
Electron Impact ◽  
Proton Affinity ◽  
Mass Spectra ◽  
Kcal Mole ◽  
Deuterium Labelling ◽  
Ion Formation ◽  
Hydronium Ion

The reactions leading to formation of the hydronium ion in the mass spectra of a number of alcohols and formate esters have been elucidated through a study of appearance potentials and metastable transitions and by the use of deuterium labelling. The results lead to ΔHf(H3O+) = 157 ± 3 kcal/mole corresponding to a proton affinity of the gaseous water molecule of 151 ± 3 kcal/mole.

Electron impact studies. XLVIII. Specific hydrogen-rearrangements in the mass spectra of ortho-alkoxyanils

1969 ◽  
Vol 22 (6) ◽  
pp. 1219 ◽  
Author(s):  
JH Bowie ◽  
PJ Hoffmann
Keyword(s):  
Electron Impact ◽  
Aromatic Ring ◽  
Mass Spectra ◽  
Bond Cleavage ◽  
Aromatic Rings ◽  
Hydrogen Atoms ◽  
Deuterium Labelling ◽  
Alkoxyl Group ◽  
Impact Studies

The mass spectra of anils with ortho-alkoxyl substituents in the aromatic ring derived from the aldehyde contain pronounced peaks prod- uced by C=N bond cleavage accompanied by one and/or two hydrogen transfers to the nitrogen-containing fragment. Deuterium-labelling studies show that the hydrogen atoms involved are those attached to the α-carbon (α to oxygen) of the alkoxyl group. The extent of the hydrogen rearrangements may be altered by the addition of further substituents to the aromatic rings.

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