Mass Spectral fragmentation patterns of heterocycles. V . Electron impact promoted mass spectral fragmentation of indolo[1,7-ab][1]benzazepine and Some of its Derivatives

1983 ◽  
Vol 20 (5) ◽  
pp. 1199-1205 ◽  
Author(s):  
L. C. Vishwakarma ◽  
A. Hallberg ◽  
A. R. Martin
Keyword(s):  
Electron Impact ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Fragmentation Patterns

Electron Impact-Induced Fragmentations of 2-Benzothiazole Sulfenamides and Related Compounds. Correlation with Rubber Vulcanization Activity

1972 ◽  
Vol 45 (1) ◽  
pp. 160-172 ◽  
Author(s):  
K. T. Potts ◽  
E. G. Brugel ◽  
J. J. D'Amico ◽  
E. Morita
Keyword(s):  
Electron Impact ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Fragmentation Patterns ◽  
Related Compounds ◽  
Rubber Accelerators

Abstract A correlation has been made between the activity of commercial rubber accelerators and vulcanizing agents and their mass spectral fragmentation patterns.

scholarly journals Mass Spectral Fragmentation Pattern of trans-1,2-Di-(3-pyridyl)ethylene and trans-1,2-Di(4-pyridyl)ethylene

1977 ◽  
Vol 32 (10) ◽  
pp. 1152-1155 ◽  
Author(s):  
Neil G. Keats ◽  
Lindsay A. Summers
Keyword(s):  
Electron Impact ◽  
Fragmentation Pattern ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Mass Spectral Fragmentation Pattern ◽  
Fragmentation Patterns

The mass spectral fragmentation patterns of trans-1,2-di-(3-pyridyl)ethylene and trans- 1,2-di-(4-pyridyl)ethylene obtained on electron impact have been elucidated. They are more complex than the disintegration pathway observed with trans-1,2-di-(2-pyridyl)-ethylene.

Electron impact mass spectral fragmentation patterns of 1-[(2′-carboxyl)pyrrolidinyl]-1-deoxy-d-fructose

1993 ◽  
Vol 280 (2) ◽  
pp. 245-251 ◽  
Author(s):  
Varoujan Yaylayan ◽  
Alexis Huyghues-Despointes ◽  
Martine C. Bissonnette ◽  
J.R.Jocelyn Paré
Keyword(s):  
Electron Impact ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
Electron Impact Mass ◽  
Fragmentation Patterns ◽  
Impact Mass

Triazolopyridine nucleosides. II. Glycosylations of 3-oxo-s-triazolo[4,3-a]pyridines with accompanying conversions into 2-oxo-s-triazolo[1,5-a]pyridine nucleosides

1977 ◽  
Vol 55 (5) ◽  
pp. 831-840 ◽  
Author(s):  
Brian Maurice Lynch ◽  
Suresh Chandra Sharma
Keyword(s):  
General Structure ◽  
Spectroscopic Properties ◽  
Mass Spectral Fragmentation ◽  
Mass Spectral ◽  
H Nmr ◽  
Pyridine Nitrogen ◽  
Methyl Derivatives ◽  
Fragmentation Patterns ◽  
Ribose Moiety ◽  
C Nmr

3-Oxo-s-triazolo[4,3-a]pyridine and various C-methyl derivatives (general structure 1) have been converted into the 2-β-D-ribofuranosyl species 2 and thence 4 via Friedel–Crafts catalyzed reaction with tetra-O-acetyl-β-D-ribofuranose, followed by deblocking. During the course of these reactions, rearrangements into the isomeric 3-β-D-ribofuranosyl-2-oxo-s-triazolo[1,5-a]-pyridines occur through ring-opening of the pyridine rings yielding species 3 and 5. The proportion of rearrangement products is dependent upon the position and number of the C-methyl substituents.Structural assignments for these compounds are based upon comparisons of spectroscopic properties (1H nmr, 13C nmr, uv) with model compounds from each isomeric series; structural assignments for these models are based on unequivocal mass-spectral fragmentation patterns. Unlike related triazolopyridine nucleosides with the ribose moiety attached to a pyridine nitrogen (Lynch and Sharma (1976)), there are no unusual aspects in the conformations of the nueleosides of types 4 and 5.

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