Tandem mass spectral studies of the fragmentation pathways of organotin compounds of general formula R3SnR?

2000 ◽  
Vol 14 (7) ◽  
pp. 383-388 ◽  
Author(s):  
N. Ostah ◽  
G. Lawson
Keyword(s):  
General Formula ◽  
Organotin Compounds ◽  
Spectral Studies ◽  
Tandem Mass ◽  
Fragmentation Pathways ◽  
Mass Spectral

Fragmentation pathways in the mass spectra of isomeric phenylazoxypyridine-N-oxides

1992 ◽  
Vol 70 (4) ◽  
pp. 1028-1032 ◽  
Author(s):  
Nigel J. Bunce ◽  
H. Stewart McKinnon ◽  
Randy J. Schnurr ◽  
Sam R. Keum ◽  
Erwin Buncel
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Electron Impact ◽  
Mass Spectra ◽  
Chemical Reduction ◽  
Ion Source ◽  
Tandem Mass ◽  
Mass Spectral Fragmentation ◽  
Fragmentation Pathways ◽  
Mass Spectral

The mass spectral fragmentation pathways of a series of phenylazoxypyridine-N-oxides have been studied under electron impact conditions using tandem mass spectrometry. Besides simple C—N cleavages, the azoxypyridine-N-oxides undergo deep-seated rearrangements directly from the molecular ion. In addition, the spectra are complicated by a purely chemical reduction of the N—O functionalities that occurs in the ion source prior to ionization.

Mass Spectral Studies of Binuclear Metal Complexes: Copper(I) Carboxylates

1973 ◽  
Vol 51 (17) ◽  
pp. 2999-3005 ◽  
Author(s):  
Denis C. K. Lin ◽  
John B. Westmore
Keyword(s):  
Fragmentation Pathway ◽  
Spectral Studies ◽  
Aryl Group ◽  
Decomposition Products ◽  
Fragmentation Pathways ◽  
Molecular Ion ◽  
Mass Spectral ◽  
Fragment Ions ◽  
Binuclear Metal ◽  
And Migration

The thermal decomposition of twenty-five cupric carboxylates was studied by mass spectrometry. In eleven cases volatile cuprous carboxylates (many of which have not been previously reported) were detected amongst the decomposition products. The cuprous carboxylates from acetic, propionic, n-butyric, isobutyric, difluoroacetic, trifluoroacetic, benzoic, p-fluorobenzoic, p-chlorobenzoic, o-chlorobenzoic, and pentafluorobenzoic acids were all found to be dimeric in the vapor phase. Two basically different fragmentation pathways can be proposed depending upon whether the copper salt is formed from an alkyl- or aryl-carboxylic acid. For the former, the spectra are dominated by even-electron fragment ions formed by initial loss of RCO2•from the molecular ion. For the latter, a parallel fragmentation pathway initiated by loss of CO2 from the molecular ion and migration of the aryl group to the metal is also present.

Mass spectral studies of some desaurins and related 3,5-bismethylene-1,2,4-trithiolanes

1968 ◽  
Vol 46 (3) ◽  
pp. 365-375 ◽  
Author(s):  
Peter Yates ◽  
Thomas R. Lynch ◽  
L. S. Weiler
Keyword(s):  
Carbonyl Group ◽  
Mass Spectra ◽  
Molecular Ions ◽  
Spectral Studies ◽  
Mass Measurements ◽  
Metastable Peak ◽  
Fragmentation Pathways ◽  
Mass Spectral ◽  
Accurate Mass Measurements ◽  
Doubly Charged

The mass spectra of three desaurins and four related 3,5-bismethylene-1,2,4-trithiolanes have been interpreted with the aid of metastable peak assignments and accurate mass measurements. Strong molecular ion peaks are observed in the case of the aryl desaurins but not in that of their trithiolane counterparts. A variety of fragmentation pathways are postulated for the molecular ions, including cleavage on either side of a carbonyl group and elimination of a molecule of acylthioketene. In the case of the desaurins the latter process results in the formation of acylthioketene molecular ions, which could be distinguished from the doubly charged desaurin molecular ions. In the case of two of the trithiolanes, it is proposed that the ions resulting from loss of acylthioketene from the molecular ions undergo a novel type of McLafferty rearrangement and loss of carbon suboxysulfide to give aryl mercaptan molecular ions.

Isotope Dilution Mass Spectral Studies on Capsaicin Analogues

2002 ◽  
Vol 8 (4) ◽  
pp. 323-328 ◽  
Author(s):  
Meehir Palit ◽  
Ritesh Mathur ◽  
Syed K. Raza
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Isotope Dilution ◽  
Spectral Studies ◽  
Tandem Mass ◽  
Mass Spectral ◽  
Tear Gas ◽  
Dilution Experiments ◽  
Fragmentation Patterns ◽  
Capsaicin Analogues

A series of capsaicin analogues have been synthesised as probable tear gas compounds. These compounds were subjected to mass spectral studies under electron ionization (EI) for their total identification. The fragmentation patterns observed in ortho- and para-substituted compounds have been substantiated by performing isotope dilution experiments and daughter-ion scans using tandem mass spectrometry.

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