Resolution and Determination of the Absolute Configuration of the Enantiomers of a trans-alpha-Disulfoxide
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Colleges, School and Institutes
The trans isomer of 2,7-di-tert-butylnaphtho[1,8-cd][1,2]dithiole 1,2-dioxide, a vic-disulfoxide of the highest thermal stability reported to date, has been resolved into its enantiomers by preparative chiral liquid chromatography. This represents the first resolution achieved of a vic-disulfoxide. The absolute configuration of the isolated enantiomers has been determined to be (+)-(S,S), (-)-(R,R) from a comparison of experimental and calculated ECD and VCD spectra. The long-wavelength ECD band at about 330 nm had a positive sign in the (+)-(S,S)-form and a negative sign in the (-)-(R,R)-enantiomer. A photocatalyzed slow decrease in optical activity was observed in solution, most likely due to racemization by homolytic (O)S-S(O) bond cleavage and bissulfinyl radical recombination.
|Number of pages||4|
|Journal||European Journal of Organic Chemistry|
|Publication status||Published - 1 Aug 2011|
- Sulfur, Circular dichroism, Density functional calculations, Configuration determination