Mass Spectrometric Investigations of Silver Halides I: Mass Spectrum, Appearance Potentials, and Fragmentation Scheme of Silver Chloride

1972 ◽  
Vol 76 (5) ◽  
pp. 410-413 ◽  
Author(s):  
P. Gräber ◽  
K. G. Weil
Keyword(s):  
Mass Spectrum ◽  
Silver Chloride ◽  
Mass Spectrometric ◽  
Silver Halides

Mass Spectral Study of D-Sesamin from Phyllarthron comorense

1974 ◽  
Vol 29 (3-4) ◽  
pp. 178-179 ◽  
Author(s):  
Krishna C. Joshi ◽  
R. K. Bansal ◽  
Pahup Singh
Keyword(s):  
Mass Spectrum ◽  
Petroleum Ether ◽  
Spectral Study ◽  
Petroleum Ether Extract ◽  
Mass Spectrometric ◽  
Ether Extract ◽  
Ion Composition ◽  
Mass Spectral Data ◽  
Mass Spectral ◽  
Mass Spectral Study

Abstract D-Sesamin, Phyllarthron comorense, Mass Spectrum The petroleum ether extract of the heartwood of Phyllarthron comorense DC affords D-sesamin along with paulownin, lapachol, dehydrotectol, dehydro-a-lapachone, /Mapachone, tectol and /5-sitosterol1. We have earlier communicated the mass spectrometric studies of dehydro-a-lapachone2 and paulownin3. The present work deals with the formulation of pos­ sible fragmentation schemes in the case of D-sesamin. This compound is a member of 3,7-dioxabicyclo-Table I. Mass spectral data of D-sesamin a. S. No. m\e Ion composition Relative intensities

5-Decynedioic Acid, an Acetylenic Compound in Human Urine

1975 ◽  
Vol 21 (13) ◽  
pp. 1964-1969 ◽  
Author(s):  
Sven Lindstedt ◽  
Göran Steen
Keyword(s):  
Mass Spectrometry ◽  
Infrared Spectroscopy ◽  
Mass Spectrum ◽  
Dicarboxylic Acid ◽  
Human Urine ◽  
Triple Bond ◽  
Osmium Tetroxide ◽  
Mass Spectrometric ◽  
Acetylenic Compound ◽  
Mass Spectrometric Evidence

Abstract An acetylenic dicarboxylic acid, 5-decynedioic acid, has been isolated from human urine. The structure was determined by mass spectrometry of several derivatives, and by infrared spectroscopy. On osmium tetroxide oxidation, a vic-diketone was formed, the mass spectrum of which established the position of the triple bond between carbon atoms 5 and 6. Mass spectrometric evidence for the presence of a small amount of the isomeric 4-decynedioic acid was also obtained. The 24-h excretion of these acids is 0.01-0.1 mmol for healthy adults on a regular diet.

MASS SPECTROMETRIC STUDY OF SUBLIMING SELENIUM

1966 ◽  
Vol 44 (24) ◽  
pp. 3063-3071 ◽  
Author(s):  
H. Fujisaki ◽  
J. B. Westmore ◽  
A. W. Tickner
Keyword(s):  
Mass Spectrum ◽  
Thermodynamic Data ◽  
Mass Spectrometric Study ◽  
Mass Spectrometric ◽  
Spectrometric Study ◽  
Temperature Range

In the mass spectrum of the vapor from grey selenium subliming in the temperature range 102 to 187 °C all possible Sen+ ions between n = 1 and n = 8 were detected in measurable quantities. The ions Se5+, Se6+, Se7+, and Se8+ arise mainly from ionization of the corresponding parent molecules, which are believed to be cyclic. At 175 °C the composition of the vapor is Se5 ≤ 29.0%, Se6 ≥ 57.5%, Se7 ≥ 11.4%, and Se8 ≥ 2.0%. Thermodynamic data are reported for the sublimation of these molecules. Small amounts of Se9+ and Se10+ were also detected.

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