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Under the optimized conditions (method A),11 a variety of organothiols
were oxidized smoothly to produce disulfides 1a¨Cr in evaporated.
The inferior, ionic liquid phase was dried under vacuum
and reused. The selenium ionic liquid maintained its good level
of oxidation activity even after being recycled four times as shown
in Figure 2. The product 1a was obtained in 98%, 98%, 96%, 96%, and
94% yields after successive cycles.
In conclusion, [bmim][SeO2(OCH3)] has proved to be an efficient
medium for the oxidation of aromatic, aliphatic, and functionalized
thiols. The Se-ionic liquid acts both as solvent and catalyst and is
easily recovered and utilized for further oxidation reactions. The
reactions are accelerated by microwaves and the desired disulfides
        were obtained in good to excellent yields.

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°®ÓëÓêÏÂ: ½ð±Ò+1 2012-05-02 19:08:54
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