Premium
The mass spectrometric fragmentation of n ‐heptane
Author(s) -
Lavanchy André,
Houriet Raymond,
Gäumann Tino
Publication year - 1978
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.1210130709
Subject(s) - fragmentation (computing) , chemistry , heptane , alkyl , ion , electron ionization , radical , photochemistry , olefin fiber , bond cleavage , hydrogen , medicinal chemistry , organic chemistry , catalysis , ionization , computer science , operating system
The electron impact fragmentation of n ‐heptane has been investigated using 13 C labelled derivatives. A mechanism is proposed for the loss of alkyl radicals where the cleavage of a CC bond is coupled with the rearrangement of a hydrogen atom, thus yielding a secondary alkyl ion that eventually fragments further by a subsequent loss of olefin. For alkyl ions with less than six carbon atoms this consecutive pathway is in competition with formation directly from the molecular ion. The consecutive pathway contributes about 15% to the intensity of the alkyl ions with four and five carbon atoms and 80% for smaller ions. The electron energy dependence was studied.