Synthesen des Anions S3N3O2−, eines stabilen sechsgliedrigen Schwefel-Stickstoff-Ringes mit einem 8π-Elektronengerüst

Syntheses of the Anion S₃N₃O₂^?, a Stable Six-membered Sulfur-Nitrogen Ring with an 8π-Electron Skeleton The dark blue-violet cyclotrithiazene-dioxide anion S₃N₃O₂^?has been synthesized on different pathways: 1. reaction of S₄N₄O₂ with alkali azides, 2. metathesis of (CH₃)₃ES₃N₃O₂ (E = Si, Sn) with CsF, 3. addition of S₄N₄O₂ and alkali bis(trimethylsilyl)-amides followed by cation exchange with tetraphenylarsonium chloride, and 4. reaction of S₄N₄O₂ with trimethylsilyliminotriphenylphosphorane in a molar ratio of 1:1. Excess iminophosphorane leads to the formation of a covalent 1.5-disubstituted S₄N₄ derivative. Reaction mechanisms will be discussed and structures of trithiatriazine-anions will be compared.