First Preparation and Structural Determination of Optically Pure Cyclic Polysulfides, 6,10-Diethyl Trithiolo[h] benzopentathiepin Monooxides

Optically pure cyclic polysulfides, 6,10-diethyl trithiolo[h]benzopentathiepin 7-oxides (4) and (5) were prepared by asymmetric oxidation of 6,10-diethyl trithiolo[h]benzopentathiepin. The structure of 4 and 5 was determined by X-ray crystallographic analysis and the configuration was confirmed as R configuration on the sulfinyl sulfur atoms.