Tautomerism of benzo- and cyclopenta-[1,2,6]thiadiazine S,S-dioxides

Abstract
The synthesis and spectroscopic characterization of fused 1,2,6-thiadiazine S,S-dioxides 1–6 have been carried out. The tautomerism of this heterocyclic system has been studied by means of experimental and theoretical techniques.