Thietane 1,1-dioxides structure analysis

The proton spectra analysis of thietane, thietane oxide and thietane dioxide at 100 and 300 MHz in the temperature range — 140 to 190 °C confirmed the puckered structure for the oxide (5a) with the sulfinyl oxygen in the equatorial orientation, as inferred from chemical-shift considerations180. It appears that the repulsive-type 1,3-interactions between the oxygen and the 3-substituents184 are operating between oxygen and the axial proton on C-3 in the unsubstituted thietane oxide (5a). For the thietane dioxide (5b ... 

Heats and enthalpies of oxidation of cis- and trans-3-t-butylthietan 1-oxides to the 1,1-dioxides by perlauric acid at 298 K have been determined. The structures of cis-2,4-diphenylthietan l-oxide and the seven-co-ordinate complex of 3,3-dimethylthietan 1-oxide with the shift reagent Eu(dpm)3 have been established by X-ray analysis. The mass spectrum of thietan 1-oxide shows fragmentation to CsHs and... 

Physical Properties.—Structure determinations by X-ray analysis of 2,2-dimethylthietan 1,1-dioxide and of 3-chlorothietan and 3-hydroxythietan l,l-dioxides have been accomplished. The vibrational frequencies of the sulphone group in thietan 1,1-dioxide and a number of other sulphones have been compared with hydrogen-bonding ability, calculated ir charge densities and S—O bond orders. " The signs of the proton coupling c[Pg.121]

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