ISSN:
0030-493X
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The mass spectral fragmentation modes of various 2-chloro-3,6-diaryl-3,4-dihydro-1,3,2-oxazaphosphorin-2-oxides - a novel ring system - reveal cycloreversion by two pathways. Retro Diels-Alder reaction by a stepwise mechanism is prominent in this system. The relative abundances of the enone and dienophile ions depend on the nature of the substituent attached to the double bond in this ring. Another retro Diels-Alder fragmentation process, involving the loss of PO2Cl from the molecular ion, is preceded by a 1,3-allylic rearrangement and is the major fragmentation mode in the metastable time scale. Further fragmentation of the [M—PO2Cl]+ imine ion seems to occur from cyclic dihydroquinoline intermediates by substitution elimination steps.
Additional Material:
1 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/oms.1210161202
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