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Electron‐impact studies—LXX . Substituent effects in the negative‐ion spectra of nitroaryl esters
Author(s) -
Bowie J. H.,
Nussey B.
Publication year - 1972
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.1210060409
Subject(s) - chemistry , substituent , mass spectrum , ion , benzoates , aryl , electron ionization , spectral line , polyatomic ion , computational chemistry , medicinal chemistry , stereochemistry , organic chemistry , alkyl , physics , astronomy , ionization
The negative‐ion mass spectra of a variety of substituted nitroaryl benzoates and aryl nitrobenzoates have been studied. Pronounced proximity effects are observed in the spectra of ortho ‐substituted compounds. The meta and para pairs fragment in a similar manner. Linear plots are observed for many cleavages using either the McLafferty or Harrison methods. Evidence is provided which suggests that the fragmentations of meta and para isomers may proceed by the same mechanistic pathway. The magnitude of ρ does not appear to provide precise information concerning the nature of the transition state for a particular reaction of a negative ion.