title: The thiosulfinyl group serves as a stereogenic center and shows diamagnetic anisotropy similar to that of the sulfinyl group.
abstract: The pseudotetrahedral geometry of the thiosulfinyl group (>S=S) in the thionosulfite which was prepared by treatment of cis-3,4-di-tert-butylthiolane-3,4-diol with 1,1'-thiobisbenzimidazole is stable enough to allow the isolation of two diastereomers. X-ray crystallographic analysis revealed that the configuration of the >S=S group of the major diastereomer (45% isolated yield) is syn to the thiolane ring, while that of the minor diastereomer (10% isolated yield) is anti to the thiolane ring. 1H NMR spectrum analysis clarified that the shielding and deshielding zones of the >S=S group are similar to those of the >S=O group. Chemical properties of the >S=S group toward thermolysis, hydrolysis, and oxidation were clarified. The absorptions or bands in the UV/vis, IR, and Raman spectra, which originate from the >S=S group, were assigned on the basis of the B3LYP/6-31G* level calculations.
authors.affiliation: Department of Chemistry, Faculty of Science, Saitama University, Sakura-ku, Saitama, Saitama 338-8570, Japan.
authors.forename: Sanae
authors.initials: S
authors.lastname: Tanaka
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Sugihara
authors.forename: Akira
authors.initials: A
authors.lastname: Sakamoto
authors.forename: Akihiko
authors.initials: A
authors.lastname: Ishii
authors.forename: Juzo
authors.initials: J
authors.lastname: Nakayama