The 70 eV and mass-analysed ion kinetic energy (MIKE) spectra of some thiophenecarboxanilides and benzoylanilides (1-10) have been compared in order to investigate the role of the aroyl (or heteroaroyl) moiety on the abundance of the competitive fragmentation reactions occurring in their molecular ions (amide-bond cleavage and phenol radical ion formation). It has been, shown that the electron ionisation induced decompositions with high (70 eV) and low (MIKE) internal energy excess are qualitatively similar, but remarkable quantitative differences have been observed that can be accounted for in terms of the different effectiveness in the transmission of electronic effects of substitueuts in the thiophene and benzene rings.
STUDIES IN ORGANIC MASS SPECTROMETRY. PART 23:ROLE OF THE AROYL GROUP ON THE COMPETITIVE FRAGMENTATION REACTIONS OF THE MOLECULAR ION OF AROYLANILIDES
FOTI, Salvatore;SALETTI, Rosaria;
1999-01-01
Abstract
The 70 eV and mass-analysed ion kinetic energy (MIKE) spectra of some thiophenecarboxanilides and benzoylanilides (1-10) have been compared in order to investigate the role of the aroyl (or heteroaroyl) moiety on the abundance of the competitive fragmentation reactions occurring in their molecular ions (amide-bond cleavage and phenol radical ion formation). It has been, shown that the electron ionisation induced decompositions with high (70 eV) and low (MIKE) internal energy excess are qualitatively similar, but remarkable quantitative differences have been observed that can be accounted for in terms of the different effectiveness in the transmission of electronic effects of substitueuts in the thiophene and benzene rings.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
