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a) For an interesting list of additives used in metal-catalyzed epoxidations with hydrogen peroxide, see ref. [10c];
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The asymmetric oxidation of tBu-S-Me gave also poor results (< 25 % ee, measured by optical rotation).
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47
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It was previously demonstrated that in the absence of any additive, the oxidation of sulfoxide to sulfone occurred in a non-enantioselective manner (see ref. [8]).
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For a definition of the stereoselectivity factor s, see ref. [16].
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For examples of asymmetric oxidations of sulfides followed by kinetic resolutions in the subsequent transformations of the sulfoxides into the sulfones, see ref. [4a].
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