Electron impact ionization mass spectra of lithocholyl amides: Evidence for a C(20) to C(23) rearrangement involving the loss of a C4H9 fragment

1994 ◽  
Vol 29 (7) ◽  
pp. 335-341
Author(s):  
Padmanabhan P. Nair ◽  
Vincent P. Flanagan ◽  
James E. Oliver
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Mass ◽  
C 23

scholarly journals Electron Impact Ionization Mass Spectra of 3-Amino 6-Chloro2-methyl Quinazolin-4-(3H)-one Derivative

2021 ◽  
pp. 1-5
Author(s):  
Osarumwense Peter Osarodion ◽  
◽  
Omotade Treasure Ejodamen ◽  
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Impact Ionization ◽  
Cyclic Compound ◽  
Electron Impact Ionization ◽  
Ionization Mass ◽  
Fragmentation Pattern ◽  
Molecular Ion ◽  
Mass Spectral ◽  
Characteristic Fragmentation

Looking at the previous studies on quinazolinones derivatives, only limited information’s are available on their mass spectral along with the preparation of novel quinazolin-4-(3H)-one derivatives The condensation of Methyl-2-amino-4-Chlorobenzoate with acetic anhydride yielded the cyclic compound 2-methyl 7-Chloro-1, 3-benzo-oxazine-4-one (1) which further produce 3-Amino-2-Methyl 7-Chloro quinazolin-4(3H)-ones (2) via the reaction with hydrazine hydrate. The compounds synthesized were unequivocally confirmed by means of Infrared, Nuclear Magnetic Resonance (1H and 13C), Gas Chromatography-Mass spectrophotometry and Elemental analysis. Discussion: The molecular ion of m/z 235 fragments to give m/z 220 by loss of –NH group. The ion of m/z 220 was broken to give m/z 206 by losing CH2 group and fragment to m/z 177 by loss of HCO. This fragmented to m/z 162 by loss of –CH3 group and then m/z 136 by loss of CN group. The loss of O gave m/z 120 which fragment to give m/z 93 by loss of –HCN and finally gave m/z 65 by loss of CO group. Conclusion: The electron impact ionization mass spectra of compound 2show a weak molecular ion peak and a base peak of m/z 235resulting from a cleavage fragmentation. Compound 2 give a characteristic fragmentation pattern. From the study of the mass spectra of compound 2, it was found that the molecular ion had fragmented to the m/z 220. The final fragmentation led to ion of m/z 93 and ion of mass m/z 65, respectively

Fragmentation selectivity in electron impact ionization mass spectra of substituted dimethoxybenzenes

1992 ◽  
Vol 27 (6) ◽  
pp. 720-723 ◽  
Author(s):  
Hisao Nakata ◽  
Fumie Jitsukawa ◽  
Hitomi Toyama ◽  
Yuko Kato
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Mass

scholarly journals Electron Impact Ionization Mass Spectra of Some 4,9-Dihetero-(X,X)-cyclodeca-1,6-dienes: Mono- and Di-benzo Analogues.

1994 ◽  
Vol 48 ◽  
pp. 319-323 ◽  
Author(s):  
Esa Mäki ◽  
Kalevi Pihlaja ◽  
Erich Kleinpeter ◽  
Jens Hartmann ◽  
Werner Schroth ◽  
...  
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Mass

Electron impact ionization mass spectra of some substituted dipyrido[1,2-a:4,3-d]pyrimidinones

1993 ◽  
Vol 28 (1) ◽  
pp. 18-22 ◽  
Author(s):  
Esa Mäki ◽  
Kalevi Pihlaja ◽  
Imre Huber ◽  
Ferenc Fülöp ◽  
Gábor Bernáth ◽  
...  
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Impact Ionization ◽  
Electron Impact Ionization ◽  
Ionization Mass
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