The 70 eV mass spectra often octahydro-1,3- and -3,1-benzoxazines with a heteroaryl-substituted phenyl group at ring position 2 were recorded in order to establish the effects of heteroaryl substituents on the fragmentation patterns. The 1,3- and -3,1-benzoxazine derivatives were easy to differentiate. The structure of the heteroaryl substituent likewise had a surprisingly large effect on the fragmentation behaviour of the compounds, in particular, the 1,2,3-benzotriazolyl group prompted fragmentation pathways that were totally absent for other isomers. All the compounds studied existed almost completely in the ring form in the gas phase. However, it was not possible to determine the exact position of the equilibrium because of the presence of the many fragment ions, some of which could originate from either tautomeric form.
|Number of pages||9|
|Journal||ACH - Models in Chemistry|
|Publication status||Published - Dec 1 1998|
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