Electron-impact studies—L: Skeletal-rearrangement fragments in the mass spectra of diphenylpyrazoles and -isoxazoles
✍ Scribed by B. K. Simons; R. K. M. R. Kallury; J. H. Bowie
- Publisher
- John Wiley and Sons
- Year
- 1969
- Tongue
- English
- Weight
- 547 KB
- Volume
- 2
- Category
- Article
- ISSN
- 1076-5174
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## Abstract Two skeletal rearrangements of the type[ABC]^+.^→[AC]^+.^ + B previously found in the mass spectra of 5‐alkoxyisoxazoles are also seen for 5‐amino‐ and 5‐alkylmercapto‐isoxazoles. They are discussed in terms of formation of an azirine ion and its ring expansion to an odd electron ion ha
The technique of Beynonz has been used to determine the 'doubly-charged ion' mass spectra of a variety of aromatic compounds which contain pronounced rearrangement peaks in their conventional mass spectra. Many, but not all, of the 'doubly-charged ion' spectra contain similar rearrangement peaks to
Laser desorption of neutral molecules followed by electron impact ionization is shown to produce gaseous ion radicals that undergo fragmentation analogous to that observed with electron impact and field ionization. Spectra were measured of heptanal and four deuterium-labeled analogs regenerated from