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Electron impact induced fragmentations of some 2,2‐disubstituted 1,3‐dithiolanes
Author(s) -
Vainiotalo Pirjo,
Nevalainen Vesa
Publication year - 1987
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210220206
Subject(s) - metastability , substituent , heteroatom , chemistry , cleavage (geology) , electron ionization , ring (chemistry) , mass spectrum , ion , electron , sulfur , crystallography , medicinal chemistry , organic chemistry , materials science , physics , ionization , fracture (geology) , composite material , quantum mechanics
Electron impact induced fragmentations of the title compounds were studied by exact mass measurement and metastable ion analysis. Sulphur atoms within the ring effectively stabilize the positive charge. In most cases the loss of the larger substituent, and not the other, methyl group, gives rise to the base peak in the spectrum. Examination of competing metastable transitions shows that generally this is also the lowest activation energy primary process. In general primary ring cleavage reactions are not important unless there is a heteroatom in the substituent that can assist this cleavage.