## Abstract Die mesoionischen 2,1,3‐Benzothiadiazin‐2,2‐dioxide **5** warden spontan aus 2‐Aminobenzalde‐hyd‐dimethylacetal (**2**) und __N__‐Alkylamidosulfonylchloriden unter CH~3~OH‐Abspaltung erhalten. Strukturuntersuchungen mit Hilfe spektroskopischer Methoden ‐ insbesondere der Röntgenphotoele
The mass spectra of some 2,1,3-benzothiadiazoline and 2,1,3-benzothiadiazine 2,2-dioxides
✍ Scribed by K. C. C. Bancroft; L. H. Morcos Guindi; A. F. Temple; B. J. Millard
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- English
- Weight
- 345 KB
- Volume
- 6
- Category
- Article
- ISSN
- 1076-5174
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## Abstract A new method for the preparation of 4‐substituted 3,4‐dihydro‐1__H__‐2,1,3‐benzothiadiazine 2,2‐dioxides is described. Treatment of __t__‐butyl __N__‐phenylsulfamoylcarbamate derivatives (**1**) with different aldehydes afforded the corresponding intramolecular cyclized products **2** u
## 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.