Author:
Bowie JH,Kallury RKMR,Cooks RG
Abstract
The mass spectra of
substituted isoxazoles are reported and discussed. The spectra of isoxazoles
are strikingly different from those of oxazoles because the initial fragmentations
of isoxazoles involve N-O bond fission. Specific skeletal-rearrangement processes
are observed in many spectra, and it is proposed that they proceed through
azirine and oxazole intermediates. Certain fragmentations have been studied by
deuterium labelling. The hydrogens attached to an isoxazole ring do not
randomize with the hydrogens of the methyl and phenyl substituents.
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