The mass spectra of some naturally occurring oxygen heterocycles and related compounds

1964 ◽  
Vol 17 (9) ◽  
pp. 975 ◽  
Author(s):  
CS Barnes ◽  
JL Occolowitz
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Methyl Radical ◽  
Naturally Occurring ◽  
Oxygen Heterocycles ◽  
Related Compounds ◽  
Oxygen Atoms

The mass spectra of some naturally occurring and synthetic α- and γ-pyrones, benzofurans, and 2,2-dimethylchromenes have been determined. Under electron impact compounds derived from coumarin lose oxygen atoms as CO, usually forming a stable benzofuran ion. 2,2-Dimethylchromenes lose a methyl radical to give a stable benzopyrylium ion, while the most prominent fission of flavanoid compounds occurs by breaking both bonds β to the A ring.

Mass Spectra of Sodium N-Alkyl and N,N-Dialkyl Dithiocarbamates and Some Related Compounds

1976 ◽  
Vol 59 (3) ◽  
pp. 622-632 ◽  
Author(s):  
Francis I Onuska ◽  
Michael E Comba
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Fragmentation Behavior ◽  
Zinc Salts ◽  
Electron Impact Mass ◽  
Related Compounds ◽  
Impact Mass

Abstract Electron impact mass spectra of 8 sodium alkyl and dialkyl dithiocarbamate salts are reported with the spectra of 2 dithiocarbamate zinc salts and N′,N′-dimetliyl-N,N-dimethylthiocarbamylsulfenamide. The investigated compounds all gave molecular ions, and generalized descriptions of their fragmentation behavior are presented.

Supplemental Measurements in Probing Electron Impact-Induced Decompositions via Mass Spectra of Labeled Compounds

1968 ◽  
Vol 22 (1) ◽  
pp. 30-33 ◽  
Author(s):  
Seymour Meyerson
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Isotope Labeling ◽  
Operating Conditions ◽  
Voltage Source ◽  
Labeled Compounds ◽  
Methyl Radical ◽  
Source Temperature ◽  
Fragment Ions ◽  
Different Parts

The value of isotope labeling in probing the chemistry underlying mass spectra is well established. The usefulness of this approach and the reliability of conclusions reached thereby can be greatly increased by checking dependence of label retentions in fragment ions on operating conditions. For example, varying the ionizing voltage, source temperature, or repeller potential alters the relative contributions of the two competing processes by which methylcyclopentane loses a methyl radical to form isomeric C5H9+ ions. The ions resulting from the two processes are derived from different parts of the original molecule and so can be distinguished by appropriate labeling.

Electron impact mass spectra of hexamethylphosphorictriamide (HMPT) and related compounds

1985 ◽  
Vol 20 (4) ◽  
pp. 318-321 ◽  
Author(s):  
Raymond Bouriet ◽  
Daniel Stahl ◽  
Jean-Claude Bollinger ◽  
ThéOphile Yvernault
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Electron Impact Mass ◽  
Related Compounds ◽  
Impact Mass

Electron Impact Mass Spectra of 3-Aryl-3-hydroxyl-2,2,4,4-tetramethylcyclobutanones and Related Compounds

2000 ◽  
Vol 47 (4B) ◽  
pp. 907-912 ◽  
Author(s):  
Shaw-Tao Lin ◽  
Wen-Chung Lin ◽  
Richard Yung-Ho Chao ◽  
Ching-Liang Huang
Keyword(s):  
Electron Impact ◽  
Mass Spectra ◽  
Electron Impact Mass ◽  
Related Compounds ◽  
Impact Mass
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