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Electron impact studies. CI —negative ion mass spectra of the carbonyl group. The ArylCH 2 CO‐ and Aryl(CH 2 ) 2 CO‐ systems
Author(s) -
Bowie John H.,
Janposri Sompong
Publication year - 1975
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.1210101209
Subject(s) - aryl , chemistry , mass spectrum , ion , medicinal chemistry , yield (engineering) , electron ionization , cleavage (geology) , spectral line , stereochemistry , photochemistry , organic chemistry , alkyl , materials science , physics , astronomy , fracture (geology) , metallurgy , ionization , composite material
Fragmentations of the molecular anions of m ‐ and p ‐nitrophenyl‐CH 2 COR yield nitrobenzyl anions in the ion source when R = Ph, but the corresponding ion from the system where R = Me is only formed after collision activation. o ‐ and p ‐Nitrophenyl parent anions undergo β‐cleavage to the carbonyl centre to produce nitrobenzyl anions. Pronounced rearrangement peaks are noted in the spectra of o ‐nitrophenyl‐ compounds. Labelling studies indicate the identity of the eliminated species, but the mechanisms of the rearrangements are complex.