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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)

✍ Scribed by Tetsuji Kametani; Shoji Hirata; Shiroshi Shibuya; Masahisa Shio

Publisher: John Wiley and Sons
Year: 1971
Tongue: English
Weight: 271 KB
Volume: 5
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210050203

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✦ Synopsis

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.

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