Electron ionization fragmentations of some N-substituted 2-N-methylimino-4,5-tetramethyleneperhydro-3,1-oxazines and related thiazines
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...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
1991
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| Sorozat: | RAPID COMMUNICATIONS IN MASS SPECTROMETRY
5 No. 5 |
| Tárgyszavak: | |
| doi: | 10.1002/rcm.1290050504 |
| mtmt: | 28028 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/32387 |
| Tartalmi kivonat: | 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 alpha-cleavage 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 stereochemical specificity, thus allowing isomeric differentiation to take place. |
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| Terjedelem/Fizikai jellemzők: | 230-233 |
| ISSN: | 0951-4198 |