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Preparation and Some Reactions of 1 H ‐1,4‐Benzothiazine Ylides (= 1 H ‐1,4‐Benzothioniaazin‐4‐ide)
Author(s) -
Iskander George M.,
Khawad Ibrahim E.,
Yousif Ghariballa,
Fisher Keith,
Fair C. Kay,
Schlemper Elmer O.
Publication year - 1985
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19850680816
Subject(s) - chemistry , benzothiazine , alkylation , hydrazine (antidepressant) , hydrate , medicinal chemistry , thermal decomposition , olefin fiber , redox , decomposition , organic chemistry , catalysis , chromatography
A series of fifteen 1 H ‐1,4‐benzothiazine ylides were obtained by alkylation of the corresponding 4 H ‐1,4‐benzothiazines 1 . Ylides of type 2g–r showed slight [1,2] rearrangements upon thermolysis besides main dealkylation to 1 and olefin production. The ylides of this type underwent redox reactions when treated with hydrazine hydrate alone, giving 3,4‐dihydro‐2 H ‐1,4‐benzothiazines mainly, while ylides of type 2a–f failed to react.