2-Substituted benzofuran fragment ion formation in the electron ionization mass spectra of 6-alkyl- and 6-aryldibenzo(d,f)(1,3)dioxepine derivatives. 1. Spirocyclization of the molecular ions in the gas phase

2007 ◽  
Vol 21 (8) ◽  
pp. 1414-1420 ◽  
Author(s):  
Michela Begala ◽  
Graziella Tocco ◽  
Gabriele Meli ◽  
Gianni Podda ◽  
Silvana A. M. Urru
Keyword(s):  
Gas Phase ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Ion Formation ◽  
Electron Ionization Mass Spectra

Differentiation of 2-Alkylthioorotic Acids, Methyl and Ethyl 2-Alkylthioorotates and Hydrazides of 2-Alkylthioorotic Acids by Using Electron Ionization Mass Spectra

2008 ◽  
Vol 14 (1) ◽  
pp. 27-35 ◽  
Author(s):  
Grazyna Bartkowiak
Keyword(s):  
Molecular Mass ◽  
Mass Spectra ◽  
Chemical Species ◽  
Molecular Ions ◽  
Electron Ionization ◽  
Relative Molecular Mass ◽  
Ionization Mass ◽  
Acid Methyl ◽  
Electron Ionization Mass Spectra ◽  
Derivatives Of

Electron ionization mass spectra of 12 derivatives of 2-thioorotic acid have been discussed and general fragmentation routes of their molecular ions have been proposed. The compounds under discussion were three groups of four chemical species (2-alkylthioorotic acid, methyl 2-alkylthioorotate, ethyl 2-alkylthioorotate and 2-alkylthioorotic hydrazide) each with the same relative molecular mass. The comparison of selected ions relative abundances and their correlation with the abundance of molecular ions enable differentiation between isomeric or isobaric species in this class of compounds.

Simulation of the electron ionization mass spectra of the Novichok nerve agent

2021 ◽  
Author(s):  
Francisco C. S. Chernicharo ◽  
Lucas Modesto‐Costa ◽  
Itamar Borges
Keyword(s):  
Mass Spectra ◽  
Nerve Agent ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Electron Ionization Mass Spectra

Electron ionization mass spectra and crystal structures of some [1,2,4]triazolo[1,2-b]- and [1,3,4]thiadiazolo[3,4-b]phthalazines

1995 ◽  
Vol 32 (1) ◽  
pp. 283-290 ◽  
Author(s):  
Karoliina Joutsiniemi ◽  
Markku Ahlgrén ◽  
Pirjo Vainiotalo ◽  
Olaf Morgenstem ◽  
Mario Meusel
Keyword(s):  
Crystal Structures ◽  
Mass Spectra ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Electron Ionization Mass Spectra

scholarly journals Uniquepara-effect in electron ionization mass spectra of bis(perfluoroacyl) derivatives of bifunctional aminobenzenes

2010 ◽  
Vol 24 (17) ◽  
pp. 2529-2532 ◽  
Author(s):  
Kirill V. Tretyakov ◽  
Nino G. Todua ◽  
Roman S. Borisov ◽  
Vladimir G. Zaikin ◽  
Stephen E. Stein ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Electron Ionization Mass Spectra ◽  
Derivatives Of

Electron ionization mass spectra of phosphorus-containing heterocycles. I. 1,4,4a,5,6,7,8,8a-octahydro-2H-3,1,2-benzoxazaphosphinine 2-oxides

2006 ◽  
Vol 20 (3) ◽  
pp. 433-437 ◽  
Author(s):  
Márta Juhász ◽  
Olli Martiskainen ◽  
Zita Zalán ◽  
Ferenc Fülöp ◽  
Kalevi Pihlaja
Keyword(s):  
Mass Spectra ◽  
Electron Ionization ◽  
Ionization Mass ◽  
Phosphorus Containing ◽  
Electron Ionization Mass Spectra

Electron ionization mass spectrometry of aryl- and fluoroalkyl-substituted palladium(II) β-diketonates and monothio-β-diketonates

1994 ◽  
Vol 72 (5) ◽  
pp. 1302-1311 ◽  
Author(s):  
Mark L. J. Reimer ◽  
John B. Westmore ◽  
Manoranjan Das
Keyword(s):  
Mass Spectra ◽  
Electron Ionization ◽  
Electron Ionization Mass Spectrometry ◽  
Ionization Mass ◽  
Aryl Group ◽  
Mass Spectral ◽  
Transition Series ◽  
Electron Ionization Mass Spectra ◽  
Positive Ion ◽  
Sulfur Donor

Positive ion electron ionization mass spectra are presented for palladium(II) β-diketonates and monothio-β-diketonates of the general form PdII[RC(X)CHC(O)R′]2, where R = phenyl, 4-methoxyphenyl, 2-thienyl, or 2-naphthyl; R′ = trifluoromethyl, pentafluoroethyl, or n-heptafluoropropyl; and X = O or S. The mass spectral behavior is in sharp contrast to that of metals of the first transition series. The spectra of the β-diketonates are dominated by metal-containing ions that arise by migration of the R group from the ligand (L) to palladium, but there is no evidence for fluorine-to-metal transfer. These findings are consistent with HSAB theory. The strong tendency of palladium to form bonds with unsaturated carbon also leads to remarkably abundant metal-containing ions that arise by losses of CO or aryloxy radicals from [PdRL]+• ions. In contrast, in decompositions of ions in the spectra of the monothio-β-diketonates, migration of the R group is suppressed; competition for palladium dπ electrons by the sulfur donor makes palladium a poorer aryl group acceptor.

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