Mass Spectra of Some 4- and 5-Substituted Derivatives of Benzoselenadiazoles

Abstract

Electron impact mass spectra of variety of eight 4-substituted and eight 5-substituted benzoselenadiazoles are presented and their spectral fragmentations are discussed. New mass spectra containing selenium in heterocyclic azole atom containing ring.

Application of the Gould–Jacobs reaction to 4-amino-2,1,3-benzoselenadiazole

“…The structure of the compounds 8aeh has been checked by using EI mass spectrometry and their fragmentation was studied. 26 Thermal cyclization of enamines 8aec, e, f under GouldeJacobs reaction conditions led regioselectively to the angularly annelated 7-(non)substituted selenadiazolo [3,4-h]quinolones 9 (Scheme 3).…”

Synthesis of [1,2,5]selenadiazolo[3,4-f]quinolone derivatives by the Gould-Jacobs reaction of 5-amino-2,1,3-benzoselenadiazole

“…The structure of the compounds 6a-h was verified by means of EI mass spectroscopy and their fragmentation was investigated. 23 Selected (benzoselenadiazol-5-ylamino)ethenes 6a-c,e,f containing at least one ester group or its synthetic equivalent (Meldrum's acid derivative) were subjected to thermal cyclization. In principal, the thermal cyclization can provide angularly and/or linearly annulated selenadiazoloquinolones.…”