New fragmentation pathways in the electron impact mass spectrometry of derivatized pyrano-1,3-diphenylprop-2-enones

1993 ◽  
Vol 28 (1) ◽  
pp. 23-26 ◽  
Author(s):  
Virinder S. Parmar ◽  
Sunil K. Sharma ◽  
Anand Vardhan ◽  
Rakesh K. Sharma ◽  
Jørgen Møller ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Electron Impact Mass Spectrometry ◽  
Fragmentation Pathways ◽  
Electron Impact Mass ◽  
Impact Mass

Electron impact mass spectrometry in a series of methyl-2-pyrimidones

1984 ◽  
Vol 62 (4) ◽  
pp. 655-660 ◽  
Author(s):  
Eric Picquenard ◽  
Jacques Riand ◽  
Jean-Pierre Brun
Keyword(s):  
Mass Spectrometry ◽  
Carbon Monoxide ◽  
Electron Impact ◽  
Methyl Groups ◽  
Electron Impact Mass Spectrometry ◽  
Methyl Substituent ◽  
Methyl Radical ◽  
Fragmentation Pathways ◽  
Electron Impact Mass ◽  
Impact Mass

The fragmentation under electron impact of various methyl-2-pyrimidones is investigated. The fragmentation is markedly influenced by the methyl substituent in the 4- or 5-position and the main fragmentation pathways of the molecular ion involve the loss of carbon monoxide or methyl radical. The latter fragmentation process shows that the methyl groups are more labile in the 4- and(or) 6-position than in the 5-position. This is corroborated by the study of trideuteriomethylated analogues. One can thus distinguish by mass spectrometry the different isomers of position, 4-methyl and 5-methyl or 4,5-dimethyl and 4,6-dimethyl-2-pyrimidones.

An unusual HgCl rearrangement in electron impact mass spectrometry of some halomercurioalkyl derivatives

1990 ◽  
Vol 27 (5) ◽  
pp. 1293-1295 ◽  
Author(s):  
Elena Ghezzo ◽  
Alberto Sturaro ◽  
Pietro Traldi ◽  
Pierfrancesco Bravo ◽  
Fiorenza Viani
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Electron Impact Mass Spectrometry ◽  
Electron Impact Mass ◽  
Impact Mass

Electron impact mass spectrometry of hemiterpenoid tricyclic quinoline alkaloids

1987 ◽  
Vol 22 (7) ◽  
pp. 462-467 ◽  
Author(s):  
Alberto Sturaro ◽  
Pietro Traldi ◽  
Pierfrancesco Bravo ◽  
Fiorenza Viani ◽  
Giuseppe Resnati
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Electron Impact Mass Spectrometry ◽  
Quinoline Alkaloids ◽  
Electron Impact Mass ◽  
Impact Mass
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