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The dichotomy of methyl loss from 2‐methylalkane molecular ions
Author(s) -
Wolkoff Peder,
Holmes John L.,
Lossing F. P.
Publication year - 1985
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.1210200106
Subject(s) - kinetic energy , ion , chemistry , range (aeronautics) , materials science , organic chemistry , physics , composite material , quantum mechanics
The kinetic energy release for methyl loss from the molecular ion of 2‐methylpentane increases c. twofold over the time‐range 1–15 μs. This result from a mixture of secondary and tertiary pentyl cations. The appearance energy showed that at threshold (and long times) only tertiary ions are formed. The molecular ion of 2‐methylhexane produces tertiary hexyl ions by loss of methyl at threshold, but in the μs time‐frame only secondary hexyl ions appear to be formed, because the kinetic energy release is small and independent of the observation time.