## Amino-4H-pyrido[4,3-dj[ 1,3]thiazine Derivatives Several heterocycles may exist in tautomeric forms. Mass spectral data on these classes of compounds may highlight the utility of the technique for their structure elucidation/ confirmation. The possible tautomerism of some recently synthesized 2
Mass spectra of some derivatives of 2H-and 4H-1, 3-benzothiazines
✍ Scribed by József Tamás; János Szabó Lajos Fodor; Gábor Bernáath
- Publisher
- John Wiley and Sons
- Year
- 1984
- Tongue
- English
- Weight
- 262 KB
- Volume
- 19
- Category
- Article
- ISSN
- 1076-5174
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## Mass spectra of %me /1(~-Pyridazinone Derivatives Recently, the preparation of several isoquinolinium pyridazinone derivatives (1,2) was reported.' We wish to report here the highly characteristic mass spectra of these compounds and to compare the spectra of l a and l b with 3 which constitutes
## Abstract The mass fragmentation behaviour of 3,4‐dihydro‐1__H__‐2,3‐benzothiazine 2,2‐dioxides was studied. The rationalizations suggested are supported by accurate mass measurements, metastable evidence and deuterium labelling.
Electrospray ionization (ESI) and tandem mass spectrometry (MS/MS) experiments, as well as electronic impact (EI) and chemical ionization (CI) techniques, have been applied to the title compounds 1a-h. The observation of different fragmentation pathways in the three sets of spectra is in accord with