MASS-SPECTROMETRIC STUDY OF SOME CYCLOALKANE ENE-CONDENSED 2-THIOXO-2,3,5,6-PYRIMIDIN-4(1H)-ONES AND CYCLOALKANE/ENE-CONDENSED [1,3]THIAZINO [3,2-A]-PYRIMIDINONES UNDER ELECTRON-IMPACT

被引:7
|
作者
HIMOTTU, M
PIHLAJA, K
STAJER, G
BERNATH, G
VAINIOTALO, P
机构
[1] ALBERT SZENT GYORGYI MED UNIV,INST PHARMACEUT CHEM,H-6720 SZEGED,HUNGARY
[2] UNIV JOENSUU,DEPT CHEM,SF-80101 JOENSUU,FINLAND
来源
ORGANIC MASS SPECTROMETRY | 1991年 / 26卷 / 05期
关键词
D O I
10.1002/oms.1210260522
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
The mass spectra of four cycloalkane/ene cis- and trans-condensed 2-thioxo-2,3,5,6-tetrahydropyrimidin-4(1H)-ones and the corresponding cycloalkane/ene cis- and trans-condensed [1,3]thiazino[3,2-a]pyrimidinones were measured. Fragmentation pathways were confirmed by metastable ion analyses and exact mass measurements. The bicyclic isomers were easy to distinguish from each other, whereas the corresponding tricyclic isomeric adducts gave fairly similar mass spectra, owing to their favoured retro-Diels-Alder fragmentations accompanied by the migration of one or two hydrogen atoms.
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页码:493 / 497
页数:5
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