The electron impact fragmentation of 3‐ and 4‐styrylpyridazine

Abstract

The electron impact mass spectrometric fragmentation of trans‐3‐ and trans‐4‐styrylpyridazine is reported in detail, including a comparison with other aza‐stilbenes. With regard to a distinction between the two isomeric styrylpyridazines, the intensity ratio of the M+ and [M‐1]+ ions, the general degree of fragmentation and the elimination pathways of nitrogen proved to be most characteristic.

Electron‐ionization‐induced mass spectral study of isomeric (E)‐N‐ethyl‐1,2‐bispyridylethylene iodides

“…9,11,13 The ( 1,4). This type of fragmentation has been observed previously for the molecular ion of (E)-1,2-bis-(2,2 0 -pyridyl)ethylene.…”