Stereochemical effects in the electron impact mass spectra of cis-trans isomeric 1,2,3,4-tetramethylcyclohexanes
β Scribed by R. Herzschuh; H. Werner; G. Mann
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 342 KB
- Volume
- 16
- Category
- Article
- ISSN
- 1076-5174
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## Abstract The 70 eV electron impact mass spectra of some 1,3,4βthiadiazolo[3,2β__a__]pyrimidinβ7βone and isomericβ5βone derivatives are discussed with the aid of defocused metastable spectra and exact mass measurements. The compounds are shown to be very stable to electron impact and ring contrac
The electron-impact (EI) and collision-induced dissociation (CID) spectra of the title compounds were studied. The main fragmentation routes of M" ions included losses of hydrocarbon species and the formation of ArCNH' cations. The geometry of ring annelation predictably affected the stabilities of