“…Fragmentation reactions involving 1H or 2H atom transfers, for nitrogen‐containing compounds, have been extensively studied 26,. 30,, 38 The ions a 31 , a 32 and a 34 are characteristic of the A 3 group, and are observable for compound 16 (quantitatively the major compound of this group). For the group A 4 , the ions a 41 , a 42 and a 44 are characteristic, and observable for all compounds of this group (compounds 18 – 20 ).…”