Electron impact induced rearrangements of organic ions. Part 111. A Beckmann-like aryl migration in substituted isoxazol-5(4H)-one molecular ions

1973 ◽  
pp. 2038 ◽  
Author(s):  
Giampietro Cum ◽  
Placido D. Giannetto ◽  
Nicola Uccella
Keyword(s):  
Electron Impact ◽  
Molecular Ions ◽  
Organic Ions

Mass spectra of 4,4-dimethyl-A-homo-4a,6-cholestadien-3-ols, 4,4-dimethyl-A-homo-5-cholestene-3,4a-diols and their derivatives

1982 ◽  
Vol 47 (10) ◽  
pp. 2768-2778
Author(s):  
Antonín Trka ◽  
Helena Velgová
Keyword(s):  
Carbon Atom ◽  
Electron Impact ◽  
Mass Spectra ◽  
Molecular Ions

Partial electron impact induced mass spectra are given of 3α-hydroxy-, 3β-hydroxy-, 3β-methoxy-, 3α-acetoxy- and 3β-acetoxy-4,4-dimethyl-A-homo-4a,6-cholestadienes, 3α,5α-epoxy-4,4-dimethyl-A-homo-5-cholestane, isomeric 4,4-dimethyl-A-homo-5-cholestene-3α(β),4aα(β)-diols, their 3-acetoxy derivatives and 3-methyl ethers. The fragmentation of the molecular ions of these substances involves the usual elimination of substituents (in the form of H2O, CH3OH, CH3COOH, CH2CO), but the most abundant and characteristic ions are products of the contraction of ring A (to a six- or five-membered one), accompanied by expulsion of a fragment containing the carbon atom C(4) with both methyls.

Effect of structural factors on the disintegration of the molecular ions of nitrophenylisoxazoles during electron impact

1974 ◽  
Vol 10 (4) ◽  
pp. 393-396
Author(s):  
K. K. Zhigulev ◽  
R. A. Khmel'nitskii ◽  
S. D. Sokolov ◽  
N. M. Przheval'skii
Keyword(s):  
Electron Impact ◽  
Molecular Ions ◽  
Structural Factors

Experimental studies of electron impact dissociation of molecular ions

1996 ◽  
Author(s):  
Nada Djurić ◽  
Yang-Soo Chung ◽  
Barry Wallbank ◽  
Gordon H. Dunn
Keyword(s):  
Electron Impact ◽  
Experimental Studies ◽  
Molecular Ions ◽  
Electron Impact Dissociation

Water loss from ester molecular ions upon electron impact

1979 ◽  
Vol 14 (5) ◽  
pp. 286-288 ◽  
Author(s):  
Theodore L. Folk ◽  
Lawson G. Wideman ◽  
Kirkwood S. Cottman
Keyword(s):  
Electron Impact ◽  
Water Loss ◽  
Molecular Ions

Rotational excitation of molecular ions by electron impact under interstellar conditions

1981 ◽  
Vol 247 ◽  
pp. 936 ◽  
Author(s):  
S. S. Bhattacharyya ◽  
B. Bhattacharyya ◽  
M. V. Narayan
Keyword(s):  
Electron Impact ◽  
Molecular Ions ◽  
Rotational Excitation
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