Mass spectra of nitrones and the isomeric oxime O-ethers
β Scribed by R. G. Kostyanovskii; A. P. Pleshkova; V. N. Voznesenskii; A. I. Mishchenko; A. V. Prosyanik; V. I. Markov
- Book ID
- 112449114
- Publisher
- Springer
- Year
- 1980
- Tongue
- English
- Weight
- 487 KB
- Volume
- 29
- Category
- Article
- ISSN
- 1573-9171
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π SIMILAR VOLUMES
## Abstract Comparative studies of the ionisation potentials and the mass spectra of some isomeric nitrones, oxaziranes, __O__βether oximes and acid amides gave no evidence for hermallyβinduced isomerisation in the mass spectrometer. Characteristic differences in the electronβimpactβinduced fragmen
extract was dried over CaCI 2 and evaporated in vacuo. The residue was purified by column chromatography [silica gel, benzene--ethyl acetate (5:1)] and recrystallized from benzene--heptane to give 1.98 g (48%) of III.
## 249 (3) 167 (1) 109 (2) 95 (3) 217 (29) 159 (3) 145 (1) 185 (2) 187 (16) 173 (7) ~ ~~ ## [M-C&IaI' Other ROA-type processes (re1 int %I lrel int %) ## 221 (35) -- ## 139 (49) --81 (41) --67 (65) \_ \_ 189 (4) 131 (100) --117 (100) \_ \_ \_ \_ --[M-CH,NCO]" 128 (100) I 59 (52) [ M -CH