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Thienoquinolines: X —The fragmentation of thieno(2,3‐ b )quinoline and its derivatives under electron impact
Author(s) -
Soundararajan N.,
Palaniappan R.,
Ramakrishnan V. T.,
Thiruvengadam T. K.,
Kanakarajan K.,
Natarajan K.,
Shanmugam P.
Publication year - 1980
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210151211
Subject(s) - quinoline , fragmentation (computing) , chemistry , ion , spectral line , stereochemistry , organic chemistry , physics , astronomy , computer science , operating system
A study has been made of the fragmentation upon electron impact of thieno(2,3‐ b )quinoline and sixteen of its derivatives containing methoxy, methylenedioxy, chloro, bromo, iodo, nitro and methyl substituents. Besides these, the fragmentation patterns of some S ‐oxides, and S,S ‐dioxides were also investigated. The majority of the spectra contain molecular ions and the principal fragmentation routes involve loss of carbon monosulphide and hydrogen cyanide from the molecular ion. Rearrangement of the molecular ion appears to precede the fragmentation process in the case of S,S ‐dioxides. The fragmentation of 4‐methylthieno(2,3‐ b )quinoline is closely analogous to that of alkylquinolines. The main features of these spectra can be predicted from the fragmentation pathways proposed for the parent thieno(2,3‐ b )quinoline.