Chemistry of the phenoxathiins and isosterically related heterocycles. XI . The synthesis and ¹³C‐NMR spectroscopy of 2‐azaphenoxathiin

Abstract

Abstract The synthesis of the 2‐azaphenoxathiin ring system via the intermediary 2‐azaphenoxathiin 2‐oxide is described. Complete assignment of the 13 C‐nmr spectrum is reported, based on the observed heteronuclear 1 H‐ 13 C spin‐couplings of the system and calculated chemical shifts as assignment criteria. The possible relation of the chemical shift of Cα to the dehidral angle of the system is also discussed.