Volume 88, Issue 6 pp. 1451-1471
Research Article

The Chemistry of the Thiosulfinyl Group: Preparation, Structure, and Spectroscopic and Chemical Properties of Cyclic Thionosulfites

Juzo Nakayama

Juzo Nakayama

Department of Chemistry, Faculty of Science, Saitama University, Sakura-ku, Saitama, Saitama 338-8570, Japan (phone and fax: +81 48-858-3390)

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Sanae Yoshida (nee Tanaka)

Sanae Yoshida (nee Tanaka)

Department of Chemistry, Faculty of Science, Saitama University, Sakura-ku, Saitama, Saitama 338-8570, Japan (phone and fax: +81 48-858-3390)

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Yoshiaki Sugihara

Yoshiaki Sugihara

Department of Chemistry, Faculty of Science, Saitama University, Sakura-ku, Saitama, Saitama 338-8570, Japan (phone and fax: +81 48-858-3390)

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Akira Sakamoto

Akira Sakamoto

Department of Chemistry, Faculty of Science, Saitama University, Sakura-ku, Saitama, Saitama 338-8570, Japan (phone and fax: +81 48-858-3390)

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First published: 21 June 2005
Citations: 13

Abstract

Treatment of the tetrahydrothiophene-3,4-diol 5 with 1,1′-thiobis-(1H-benzimidazole) (6) furnished two diastereoisomers of the novel cyclic thionosulfite 4 with different configurations at the pseudo-tetrahedral center of the thiosulfinyl (SS) group. The configuration of the SS group of the major diastereoisomer (isolated in 45% yield) was established to be syn to the thiolane ring, as determined by X-ray crystallographic analysis, while that of the minor diastereoisomer (isolated in 10% yield) was anti. 1H-NMR Spectroscopic analysis clarified that the shielding and deshielding zones of the SS group are similar to those of the well-documented SO group. Characteristic absorptions of the SS group in the IR, Raman, and UV/VIS spectra were assigned on the basis of calculations at the B3LYP/6-31G* level. The reactivity of the SS group toward thermolysis, hydrolysis, and oxidation was examined. The SS group is more resistant toward oxidation than the divalent sulfide S-atom, but is oxidatively converted to the SO group.

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