Premium
Decomposition of 1‐(2‐thienyl)alkylalkanones under electron‐impact
Author(s) -
Foster Norman G.,
Higgins Robert W.
Publication year - 1969
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.1210021009
Subject(s) - ion , fragmentation (computing) , chemistry , electron ionization , methylene , ionization , molecule , metastability , cleavage (geology) , hydrogen atom , bond cleavage , alkyl , hydrogen , photochemistry , medicinal chemistry , materials science , organic chemistry , catalysis , fracture (geology) , computer science , composite material , operating system
The major fragmentation paths of the 1‐(2‐thienyl)alkylalkanones ionized by electron impact are delineated by means of isotopically labeled molecules, metastable ion peaks and low ionization voltage data. A prominent process is cleavage of the bond beta to the carbonyl group with the concurrent rearrangement of a hydrogen atom. Another important process is cleavage alpha to the carbonyl group to produce the thienoylium ion analogous to the benzoylium ion. As expected, the data show that increasing the chain length by two methylene groups increases the total ion current. The bulk of this increase is found in the increased ion current of the rearrangement ion with the remainder being associated with alkyl fragments and oxygenated ion species.