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 |
| LEADER | 01818nab a2200289 i 4500 | ||
|---|---|---|---|
| 001 | publ32387 | ||
| 005 | 20250404083415.0 | ||
| 008 | 250404s1991 hu o 000 eng d | ||
| 022 | |a 0951-4198 | ||
| 024 | 7 | |a 10.1002/rcm.1290050504 |2 doi | |
| 024 | 7 | |a 28028 |2 mtmt | |
| 040 | |a SZTE Publicatio Repozitórium |b hun | ||
| 041 | |a eng | ||
| 100 | 1 | |a Pihlaja Kalevi | |
| 245 | 1 | 0 | |a Electron ionization fragmentations of some N-substituted 2-N-methylimino-4,5-tetramethyleneperhydro-3,1-oxazines and related thiazines |h [elektronikus dokumentum] / |c Pihlaja Kalevi |
| 260 | |c 1991 | ||
| 300 | |a 230-233 | ||
| 490 | 0 | |a RAPID COMMUNICATIONS IN MASS SPECTROMETRY |v 5 No. 5 | |
| 520 | 3 | |a 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. | |
| 650 | 4 | |a Kémiai tudományok | |
| 650 | 4 | |a Biológiai tudományok | |
| 650 | 4 | |a Általános orvostudomány | |
| 700 | 0 | 2 | |a Liukko-Sipi Sirpa |e aut |
| 700 | 0 | 2 | |a Fülöp Ferenc |e aut |
| 700 | 0 | 2 | |a Bernáth Gábor |e aut |
| 700 | 0 | 2 | |a Vainiotalo Pirjo |e aut |
| 856 | 4 | 0 | |u http://publicatio.bibl.u-szeged.hu/32387/1/aok_klny_618_91.pdf |z Dokumentum-elérés |