Mass Spectra of New Heterocycles. XVII. Main Fragmentation Routes of Molecular Ions of 4-Alkoxy-5-amino-3-methylthiophene-2-carbonitriles under Electron and Chemical Ionization


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For the first time decomposition was investigated of 4-alkoxy-5-amino-3-methylthiophene-2-carbonitriles under the conditions of electronic (70 eV) and chemical (reagent gas methane) ionization. At the electronic ionization the compounds under study [except for 4-(1-ethoxyethoxy) and 4-(ferrocenylmethoxy) derivatives] form stable molecular ions that decompose mainly by the cleavage of an alkyl radical from the alkoxy-substituent. Further fragmentation of the arising ion [M–Alk]+ depends on the substituent nature in the amino group. In the mass spectrum of 4-(ferrocenylmethoxy)-substituted thiophene peaks of the ion [FcCH2]+ and its fragmentation products prevail. In the mass spectra of chemical ionization predominant peaks belong to ions M, [M + H]+ and [M + C2H5]+, and fragment ions are absent.

Sobre autores

L. Klyba

Favorskii Irkutsk Institute of Chemistry, Siberian Branch

Autor responsável pela correspondência
Email: klyba@irioch.irk.ru
Rússia, ul. Favorskogo 1, Irkutsk, 664033

N. Nedolya

Favorskii Irkutsk Institute of Chemistry, Siberian Branch

Email: klyba@irioch.irk.ru
Rússia, ul. Favorskogo 1, Irkutsk, 664033

E. Sanzheeva

Favorskii Irkutsk Institute of Chemistry, Siberian Branch

Email: klyba@irioch.irk.ru
Rússia, ul. Favorskogo 1, Irkutsk, 664033

O. Tarasova

Favorskii Irkutsk Institute of Chemistry, Siberian Branch

Email: klyba@irioch.irk.ru
Rússia, ul. Favorskogo 1, Irkutsk, 664033

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