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Mass spectra of methoxychlorobenzenes (chloroanisoles)
Author(s) -
Korhonen Ilpo O. O.,
Knuutinen Juha,
Lahtiperä Mirja,
Klein Paul
Publication year - 1988
Publication title -
biomedical and environmental mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0887-6134
DOI - 10.1002/bms.1200170606
Subject(s) - fragmentation (computing) , ion , metastability , mass spectrum , chemistry , structural isomer , spectral line , chlorine , electron ionization , formaldehyde , chlorine atom , computational chemistry , crystallography , stereochemistry , medicinal chemistry , organic chemistry , physics , astronomy , computer science , ionization , operating system
Electron impact mass spectra of all 19 ring‐substituted chloroanisoles have been investigated. The fragmentation pathways were elucidated with the aid of the 1st field‐free region metastable ions. The greatest disparity between the spectra of the positional isomers is shown with the [M – CH 3 ] + and [M – CH 2 O] +˙ ions, i.e., the ortho and para isomers preferentially lose ˙CH 3 , whereas the meta isomers generally show both loss of ˙CH 3 and elimination of formaldehyde, the latter process being more dominant with the meta ‐monochloro and di‐ and trichloro isomers having two meta ‐chlorine atoms. Characteristic for all isomers is also the abundant M +˙ and [M – CH 3 – CO] + ions, the other fragmentation routes producing ions of lower abundance.