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Field ionization and electron impact mass spectra of cycloolefins
Author(s) -
Rang Silvia,
Strenze Tiiu,
Müürisepp Mati,
Eisen Olaf
Publication year - 1984
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.1210190409
Subject(s) - electron ionization , mass spectrum , chemistry , isomerization , ionization , ion , field desorption , substituent , alkyl , double bond , mass spectrometry , bond cleavage , polyatomic ion , ring (chemistry) , spectral line , analytical chemistry (journal) , computational chemistry , stereochemistry , organic chemistry , catalysis , physics , chromatography , astronomy
The field ionization mass spectra of monosubstituted cyclopentenes and cyclohexenes with C 1 ‐C 7 n ‐alkyl and C 4 ‐C 5 isoalkyl substituents in positions 1 and 3 have been investigated and compared with the previously reported electron impact mass spectra of these compounds. The cleavage of the CC bond β to the double bond in the non‐isomerized molecular ion was found to be a typical degradation reaction of the higher homologues in the strong electric field. So, by means of the field ionization mass spectra, the >C 1 alkyl substituent can be readily located in the parent molecule. The electron impact mass spectra exhibit a less specific fragment ion distribution for positional isomers due to the extensive molecular ion isomerization prior to decomposition, but provide useful information on the ring size. For structure determination it is appropriate to use both ionization techniques.