ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The positive-ion electron impact mass spectra of twelve spiro-1-pyrazolines have been recorded as 70 eV electron energy and the dat analyzed to elucidate their fragmentation pathways. None of these compounds gave abundant molecular ions (M+) due to the instability of the pyrazoline ring. The first step in the decomposition of M+ ions is the elimination of a nitrogen molecule followed by a rearrangement resulting in the formation of the cation radical [M-28]+, the decomposition of which is discussed in detail. The proposed fragmentation pathways and their mechanisms are supported by high-resolution data, linked-scan measurements at constant B/E and collision-induced dissociation-mass-analyzed ion kinetic energy spectra.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290061008
