Electron ionization (EI) mass spectra of some 3,4-disubstituted-1,2,4-oxadiazin-5-ones and -thiones and 3,5-disubstituted 1,2,4-oxadiazin-6-ones

Pihlaja K., Heinonen S., Martiskainen O., Agirbas H., Arikan N.

ARKIVOC, pp.337-345, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume:
  • Publication Date: 2009
  • Doi Number: 10.3998/ark.5550190.0010.e28
  • Journal Name: ARKIVOC
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.337-345
  • Bursa Uludag University Affiliated: Yes


The EI mass spectra of 3,4-disubstituted-1,2,4-oxadiazin-5-ones 1-6 and -thiones 7,8 and 3,5-disubstituted 1,2,4-oxadiazin-6-ones 9,10 were recorded and their fragmentation pathways solved and compared with each other. The fragmentation routes of 5-ones and 5-thiones do not differ very much from each other but compounds 9 and 10 behave differently as could be expected based on their lactone type structures. Only compounds 4-6 exhibit a loss of CO and compound 7 a loss of NO. The loss of a benzyl group dominates the behaviour of compounds 1 and 2 which showed only few additional fragmentations. Some earlier data on some 3,4-disubstituted-1,2,4-diazin-5-ones 11-13 and -thiones 14,15 have been reanalyzed and discussed in further detail.