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Elimination and rearrangement reactions in the electron impact ionization mass spectrometry of 2,4,5,5-tetrasubstituted 1,2,4-triazolidine-3-thiones

✍ Scribed by Kalevi Pihlaja; Esa Mäki; Klaus Schulze; Christian Richter

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
351 KB
Volume
26
Category
Article
ISSN
1076-5174

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✦ Synopsis

The electron impact mass spectra of 2,4,5,5-tetrasubstitted 1,2,4triazolidine-3thiones exhibited, in addition to four main routes of fragmentation, a reaction leading to the formation of ~alkyl-l,2,Qtriazoline-3-thiows via an elimination of HR4 (R' < R4 are the substituents at C(5)) or via a McLafferty-type reaction from the rearranged molecular ion in the case of the 5,Sspiro derivatives. Substitution at N(2), N(4) and/or C(5) had a decisive effect on the contribution of the alternative reaction routes. Some fragments via the triazoline-thione structure were also formed.

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