Direct Exposure Probe Electron Ionization and Chemical Ionization Mass Spectra of Group I Metal Acetates

1994 ◽  
Vol 33 (18) ◽  
pp. 3970-3975 ◽  
Author(s):  
Yu Cao ◽  
Kenneth L. Busch
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Group I ◽  
Direct Exposure

Electron ionization and chemical ionization mass spectra of pyridinium and isoquinolinium ylides

1984 ◽  
Vol 19 (6) ◽  
pp. 285-290 ◽  
Author(s):  
D. V. Bowen ◽  
P. W. Skett ◽  
J. Thorpe ◽  
A. O. Plunkett
Keyword(s):  
Mass Spectra ◽  
Chemical Ionization ◽  
Electron Ionization ◽  
Ionization Mass

Electron Ionization and Chemical Ionization Mass Spectra of Some Nα-(t-Butoxycarbonyl)-O-(diorganylphosphono)-L-serines

1992 ◽  
Vol 45 (10) ◽  
pp. 1759 ◽  
Author(s):  
JW Perich ◽  
RB Johns
Keyword(s):  
Thermal Decomposition ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Major Pathway ◽  
Ethyl Methyl ◽  
The Poor ◽  
Ionization Spectrum ◽  
Chemical Ionization Spectrum

N α -(t- Butoxycarbonyl )-O-( diorganylphosphono )L- serines underwent a complex fragmentation under both electron ionization and chemical ionization ( isobutane ) with the dominant pathway being a function of the phosphono organyl group (phenyl, ethyl, methyl, benzyl, t-butyl). In the case of the phenyl-, ethyl- and methyl-substituted derivatives, both electron ionization (15 eV) and chemical ionization mass spectra showed that β-eliminative loss of the seryl residue was the major pathway, and that the two-step loss of the t- butoxycarbonyl group from the [MH]+ ion was a inor pathway. In the case of the benzyl- and t-butyl-substituted derivatives, the poor mass spectra obtained under electron ionization conditions indicated that extensive thermal decomposition of the sensitive dibenzyl or di-t-butyl phosphate functionality occurred on the heated probe. Under the softer chemical ionization conditions, the mass spectrum of the benzyl-substituted derivative showed that loss of the phosphono benzyl group as the tropylium ion was the major fragmentation, and that both loss of the seryl residue by β-elimination and the cleavage of the t- butoxycarbonyl group were minor events. However, the poor chemical ionization spectrum obtained for the t-butyl derivative indicated that the di-t-butyl phosphate functionality was still sensitive to these milder conditions, with the compound undergoing decomposition on the heated probe.

Sign in / Sign up

Export Citation Format

Share Document