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Electron impact ionization mass spectra of 2,4,5,5‐tetrasubstituted 1,2,4‐triazolidine‐3‐thiones. The effect of the ethoxycarbonyl group at position 4
Author(s) -
Mäki Esa,
Pihlaja Kalevi,
Schulze Klaus,
Richter Christian
Publication year - 1993
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570300454
Subject(s) - chemistry , substituent , fragmentation (computing) , electron ionization , mass spectrum , ion , ionization , medicinal chemistry , mass spectrometry , chemical ionization , derivative (finance) , stereochemistry , organic chemistry , chromatography , computer science , financial economics , economics , operating system
The electron impact ionization mass spectra of 2,4,5,5‐tetrasubstituted 1,2,4‐triazolidine‐3‐thiones studied confirmed that the substituent at position 4 has the most dramatic influence on the fragmentation pattern. When the substituent is a methylallyl group the molecular ions exhibit four main routes of fragmentation, but when it is an ethoxycarbonyl/acetyl or a methyl group these direct decompositions of the molecular ion become less abundant. Interestingly all 4‐ethoxycarbonyl derivatives and the 4‐acetyl derivative exhibited the ions [M‐R 4 ‐COOC 2 H 4 ] + and [M‐R 4 ‐COCH 2 ] + , respectively, with the same composition.