SYNTHESIS AND REDOX PROPERTIES OF SUBSTITUTED 1,4,2-DITHIAZINES - X-RAY CRYSTAL-STRUCTURE OF 3-(4-METHOXYPHENYL)-5,6-DIMETHYL-1,4,2-DITHIAZINE

The efficient synthesis of a range of novel 1,4,2-dithiazine derivatives by ring expansion of the corresponding 1,3-dithiolium cations in the presence of iodine and aqueous ammonia is reported; the eight pi-electron 1,4,2-dithiazine ring is folded about the S...S axis, as shown by single crystal X-ray analysis, and the heterocycle is electrochemically oxidised to yield, sequentially, the radical cation and dication species.