The electron impact mass spectra (EI/MS) of 2- and 3-carboxanilides are dominated by the peak due to the corresponding thenoyl cations formed by cleavage of the C-N amide bond. This reaction is not affected by the polar effect of the substituents present in the phenyl ring. Most of the 2'-substituted derivatives undergo a cyclisation reaction with ejection of the substituent. In addition, for 2'-methyl and 2'-ethyl derivatives of both series of thiophene anilides a cryptic ''ortho''-effect was suggested as responsible of the charge retention in the aniline moiety.
Electron Impact Mass Spectra of Some 2’-, 3’-, and 4’-Substituted Thiophene-2- and 3-Carboxanilides
DE MARIA, Paolo;FONTANA, Antonella;
1991-01-01
Abstract
The electron impact mass spectra (EI/MS) of 2- and 3-carboxanilides are dominated by the peak due to the corresponding thenoyl cations formed by cleavage of the C-N amide bond. This reaction is not affected by the polar effect of the substituents present in the phenyl ring. Most of the 2'-substituted derivatives undergo a cyclisation reaction with ejection of the substituent. In addition, for 2'-methyl and 2'-ethyl derivatives of both series of thiophene anilides a cryptic ''ortho''-effect was suggested as responsible of the charge retention in the aniline moiety.File in questo prodotto:
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