Mass spectra of p-(tolylsulfonyl)diazines(Ar-SO
2-C
6H
4-CH
3, I) were examined. The molecular ion (M
+) of I seems to undergo the migration to form the rearranged molecular ion of p-tolyl diazinesulfinate(M
1) or that of diazinyl p-toluenesulfinate(M
2). The general fragmentation patterns of M
+, M
1+ or M
2+ are summarized by some pathways. The principal fragments of I are C
7H
7+ formulated as the tropylium ion, Ar
+ formed by the loss of p-tolylsulfonyl group from M
+, C
7H
7 and ArC
7H
7+ yeilded by the expulsion of sulfur dioxide from M
+. It shows that the principal fragmentation of I proceeds by the pathway having the stable fragment ions.
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