Chemical ionization mass spectrometry of complex molecules. XI. stereochemical and conformational effects in the isobutane chemical ionization mass spectra of some steroidal amino alcohols

1973 ◽  
Vol 95 (20) ◽  
pp. 6666-6669 ◽  
Author(s):  
P. Longevialle ◽  
G. W. A. Milne ◽  
H. M. Fales
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Amino Alcohols ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Complex Molecules ◽  
Conformational Effects

Chemical Ionization Mass Spectrometry of Organophosphorus Insecticides

1974 ◽  
Vol 57 (5) ◽  
pp. 1050-1055 ◽  
Author(s):  
Roy L Holmstead ◽  
John E Casida
Keyword(s):  
Mass Spectrometry ◽  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Structure ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Organophosphorus Insecticides ◽  
Fragmentation Patterns

Abstract The chemical ionization (CI) mass spectra of 15 important organophosphorus insecticides and 14 of their major metabolites are discussed in relation to the effect of chemical structure on fragmentation patterns. The fragments obtained with CI are sometimes quite different from those formed on electron impact and, in general, simpler spectra are obtained with CI.

Chemical ionization mass spectrometry of complex molecules. Biogenic amines

1973 ◽  
Vol 45 (11) ◽  
pp. 1952-1954 ◽  
Author(s):  
G. W. A. Milne ◽  
H. M. Fales ◽  
R. W. Colburn
Keyword(s):  
Mass Spectrometry ◽  
Biogenic Amines ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Complex Molecules

Chemical ionization mass spectrometry of complex molecules. IV. Amino acids

1970 ◽  
Vol 92 (17) ◽  
pp. 5170-5175 ◽  
Author(s):  
George W. A. Milne ◽  
Theodore. Axenrod ◽  
Henry M. Fales
Keyword(s):  
Mass Spectrometry ◽  
Amino Acids ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Complex Molecules

Chemical ionization mass spectrometry of complex molecules. II. Alkaloids

1970 ◽  
Vol 92 (6) ◽  
pp. 1590-1597 ◽  
Author(s):  
Henry M. Fales ◽  
Helen A. Lloyd ◽  
George W. A. Milne
Keyword(s):  
Mass Spectrometry ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Complex Molecules

Chemical ionization mass spectrometry of complex molecules. VIII. Esters of di- and tricarboxylic acids

1971 ◽  
Vol 43 (13) ◽  
pp. 1785-1789 ◽  
Author(s):  
H. M. Fales ◽  
G. W. A. Milne ◽  
R. S. Nicholson
Keyword(s):  
Mass Spectrometry ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Complex Molecules

Mechanism and structure in chemical ionization mass spectrometry: tricyclic flavanoid compounds

1973 ◽  
Vol 26 (7) ◽  
pp. 1577 ◽  
Author(s):  
JW Clark-Lewis ◽  
CN Harwood ◽  
MJ Lacey ◽  
JS Shannon
Keyword(s):  
Mass Spectrometry ◽  
Mass Spectra ◽  
Chemical Ionization ◽  
Ionization Mass Spectrometry ◽  
Chemical Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Fragmentation Pathways ◽  
Fragment Ions ◽  
Metastable Ions ◽  
Fragmentation Patterns

The chemical ionization mass spectra of a series of tricyclic flavanoid compounds have been examined using isobutane and hydrogen as reagent gases and the fragmen- tation modes have been correlated systematically in terms of structure. The technique produces simple fragmentation patterns and abundant metastable ions. The use of deuterium as reagent gas reveals the influence of extraneous water on the spectra and facilitates the interpretation of the fragmentation pathways. The fragment ions appear to arise from isomeric progenitors protonated at different sites in the molecules.

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