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Mass spectra of some α‐substituted phenyl‐α,α′‐dimethoxyl ketones and their derivatives
Author(s) -
Chen Guoqiang,
Zhang Pang
Publication year - 1991
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.1210260105
Subject(s) - mass spectrum , chemistry , nitro , ion , medicinal chemistry , cleavage (geology) , spectral line , stereochemistry , organic chemistry , materials science , alkyl , physics , astronomy , fracture (geology) , composite material
The mass spectra of some α‐substituted phenyl‐α,α′‐dimethoxyl ketones (compounds 1) and their 2,4‐dinitrophenylhydrazones (compounds 2) and semicarbazones (compounds 3) have been studied. The characteristic fragments at m / z (M − 73) from compounds 1, m / z (M − 253) from compounds 2 and m / z (M − 130) from compounds 3 are abundant and proposed to be [ArCROCH 3 ] + . Fragmentations yielding [M + − 49] from compounds 2 are abnormal and probably involve the methoxyl and nitro groups. The intense peak at m / z 130 due to [CH 3 OCH 2 CNNHCONH 2 ] + from compounds 3 corresponds to α‐cleavage of the molecular ion. Some other fragments from these new compounds are interpreted in this paper.