ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The 70 eV electron ionization mass spectra of six cyclohexane fused 2-N-methyliminoperhydro-3,1-oxazines and six related thiazines were recorded and their fragmentation behaviour studied by metastable-ion analysis and exact mass measurement. For the unsubstituted compounds, decompositions which can be rationalized to start as a simple α-cleavages with respect to the ring nitrogen atom were dominant. Many of these reactions were accompanied by a hydrogen-atom transfer to the neutral fragment lost. N-substitution prompted more extensive hydrogen migrations to take place, where hydrogen atoms were transferred to the heterocyclic part of the molecule. Only methyl-substituted compounds showed remarkable sterochemical specificity, thus allowing isomeric differentiation to take place.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290050504
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