Atmospheric pressure ionisation mass spectrometric fragmentation pathways of noscapine and papaverine revealed by multistage mass spectrometry and in-source deuterium labelling

2006 ◽  
Vol 20 (3) ◽  
pp. 473-480 ◽  
Author(s):  
James R. Wickens ◽  
Richard Sleeman ◽  
Brendan J. Keely
Keyword(s):  
Mass Spectrometry ◽  
Atmospheric Pressure ◽  
Mass Spectrometric ◽  
Deuterium Labelling ◽  
Fragmentation Pathways ◽  
Mass Spectrometric Fragmentation ◽  
Ionisation Mass

Formation of Organometallic Species, [M – H]+ Ions and Radical Cations upon Mass Spectrometric Fragmentation of Mercury–Crown Ether Complexes

2009 ◽  
Vol 15 (4) ◽  
pp. 479-486 ◽  
Author(s):  
Rafał Frański ◽  
Błażej Gierczyk
Keyword(s):  
Mass Spectrometry ◽  
Crown Ether ◽  
Radical Cations ◽  
Mass Spectrometric ◽  
Tandem Mass ◽  
Fragmentation Pathways ◽  
Factors Influencing ◽  
Crown Ether Complexes ◽  
Mass Spectrometric Fragmentation ◽  
Ether Molecule

Mass spectrometric fragmentation pathways of [M + HgClO4]+ (M – crown ether molecule), determined by tandem mass spectrometry experiments, are discussed in detail. The decomposition of [M + HgClO4]+ proceeds along three fragmentation pathways: formation of [M – H]+ ions, formation of organometallic species, namely [M – H + Hg]+ ions, and formation of radical cations [M]+•. The factors influencing these processes, namely crown ether cavities and the presence of electron withdrawing/electron donor groups, have been discussed.

Mass spectrometry of diamantane and some adamantane derivatives

1980 ◽  
Vol 58 (20) ◽  
pp. 2189-2195 ◽  
Author(s):  
Robert J. Waltman ◽  
A. Campbell Ling
Keyword(s):  
Mass Spectrometry ◽  
Hydrogen Atom ◽  
Mass Spectrometric ◽  
Adamantane Derivatives ◽  
Intensity Data ◽  
Metastable Peak ◽  
Fragmentation Pathways ◽  
Peak Intensity ◽  
Mass Spectrometric Fragmentation

The mass spectrometric fragmentation of adamantane, adamantane-d6, diamantane, 1- and 2-adamantanol, and 3,5,7-trimethyl-1-adamantanol has been re-examined, and new data for diamantane and 3,5,7-trimethyl-1-adamantanol are presented in more detail. Metastable peak data have been used to support potential fragmentation pathways. Simple statistical considerations applied to peak intensity data seem to indicate that ionization occurs at the primary bridgehead in both adamantane and diamantane, and that loss of a primary hydrogen is favored over loss of a secondary hydrogen atom.

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