ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Comparison of metastable peaks in the mass spectra of the monoterpenes alloöcimene and a-pyronene shows that they fragment through common ions. It is concluded that the acyclic triene (alloöcimene) undergoes electrocyclic ring closure to the cyclic diene (a-pyronene) and fragmentation then proceeds from an ionised form of a cyclic diene. The fragmentation proceeds to a series of ions [CnH2n-5]+, the decomposing forms of which are inferred to be protonated benzene (n = 6) and dihydrotropylium ions (n = 7, 8, 9). These ions react via loss of H2, the dihydrotropylium → tropylium conversion being characterised by a relatively large kinetic energy release in both un-substituted (n = 7) and methyl-substituted (n = 8, 9) cases.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210100205
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