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 | Zendy

Mäki Esa | Zendy; Pihlaja Kalevi | Zendy; Schulze Klaus | Zendy; Richter Christian | Zendy

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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.

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