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Studies on the syntheses of azole derivatives—V: The mass spectra of 1,2,4‐triazoles and oxadiazoles (studies on the syntheses of heterocyclic compounds—CCCLXXIV )
Author(s) -
Kametani Tetsuji,
Hirata Shoji,
Shibuya Shiroshi,
Shio Masahisa
Publication year - 1971
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210050203
Subject(s) - fragmentation (computing) , mass spectrum , chemistry , azole , alkyl , electron ionization , ion , organic chemistry , ionization , computer science , biology , antifungal , microbiology and biotechnology , operating system
Abstract The electron‐impact induced fragmentation of twenty 3‐alkyl‐1‐phenyl‐Δ 2 ‐1,2,4‐triazolin‐5‐ones, three 1‐phenyl‐1,2,4‐triazolin‐3,5‐diones and ten 2‐alkyl‐4‐phenyloxadiazolin‐5‐ones has been studied by conventional mass spectrometry. The major cleavages take place in the 1‐phenyl‐Δ 2 ‐1,2,4‐triazolin‐5‐one nucleus, producing three major fragment ions. 4‐Phenyloxadiazolin‐5‐ones exhibit a similar fragmentation pattern to 1‐phenyl‐Δ 2 ‐1,2,4‐triazolin‐5‐ones. Furthermore, several additional fragmentation processes are observed in the case of specific 1,2,4‐triasolines.