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The mass spectral fragmentation patterns of trans-1,2-di-(3-pyridyl)ethylene and trans- 1,2-di-(4-pyridyl)ethylene obtained on electron impact have been elucidated. They are more complex than the disintegration pathway observed with trans-1,2-di-(2-pyridyl)-ethylene.

Mass Spectral Fragmentation Pattern of trans-1,2-Di-(3-pyridyl)ethylene and trans-1,2-Di(4-pyridyl)ethylene