Mass spectra of pyrazine <i>N</i>‐oxides. Studies on pyrazine derivatives. III

Abstract

Abstract The mass spectra of pyrazine 4‐ and 1‐oxides, their di‐ N ‐oxides and corresponding pyrazines have been determined. The fragmentations induced by electron impact were examined by means of deuterium labeling and high‐resolution measurements. The most pronounced feature of the spectra was the appearance of M‐16 ion peaks. In the case of the methyl and methoxy derivatives of 1‐oxides, the intensity ratio of M‐17/M‐16 was larger than in the 4‐oxides.